tsshbatch - Run Commands On Batches Of Machines
tsshbatch is a powerful tool for automating activities
on many servers at a time. This also gives you to power
to make many mistakes at a time! This is especially
true if you have
sudo privilege promotion
capabilities on the systems in your care. So be careful
We therefore STRONGLY recommend you do the following things to mitigate this risk:
- Read This Fine Manual from beginning to end.
- Practice using
tsshbatchon test machines or VMs that can easily be recovered or reimaged if you break someting.
- Make heavy use of test mode (which is the default) to see what the program would do if it actually ran in execution mode.
tsshbatch.py [-EKLNSTWaehkqstvxy -G 'file dest' -P 'file dest' -f cmdfile -l logfile -n name -p pw ] -H 'host ..' -i 'hostfile ...' [command arg ... ]
tsshbatch is a tool to enable you to issue a command to many
hosts without having to log into each one separately. When writing
scripts, this overcomes the
ssh limitation of not being able to
specify the password on the command line.
You can also use
from- and to many hosts at once.
tsshbatch also understands basic
sudo syntax and can be used
to access a host,
sudo a command, and then exit.
tsshbatch thus allows you to write complex, hands-off scripts that
issue commands to many hosts without the tedium of manual login and
sudo promotion. System administrators, especially, will find this
helpful when working in large server farms.
tsshbatch supports a variety of options which can be specified
on either the command line or in the
-B Print start, stop, and elapsed execution time statistics. This does not include any time spent for interactive prompting and response, but reflects actual program runtime. (Default: Off) -C configfile Specify the location of the ssh configuration file. (Default:
tsshbatchwrites it's own errors to
stderr. It also writes the
stderroutput from each host it contacts to the local shell's
-eoption has been selected).
-Eoption redirects any such
tsshbatchoutput intended for
stdoutinstead. This avoids the need to do things like
2>&1 | ...` on the command line when you want to pipe all ``tsshbatchoutput to another program.
-K Force prompting for passwords. This is used to override a prior
GET file on host and write local dest directory.
specis a quoted pair of strings. The first specifies the path of the source file (on the remote machine) to copy. The second, specifies the destination directory (on the local machine):
tsshbatch.py -G "/foo/bar/baz /tmp" -i hostlist
/foo/bar/bazfrom every machine in
hostlistfileto the local
/tmp/directory. Since all the files have the same name, they would overwrite each other if copied into the same directory. So,
tsshbatchprepends the string
hostname-to the name of each file it saves locally.
List of hosts on which to run the command. This should be enclosed in quotes so that the list of hosts is handed to the -H option as a single argument:
-H 'host1 host2 host3'
This option may appear on the command line multiple times. The hosts will be processed in the order in which they appeared on the command line.
-L List names of all (if any) host- and command files found on their respective search paths. These are listed in the order they are found on those paths. -N Force interactive username dialog. This cancels any previous request for key exchange authentication. -P spec
PUT file from local machine to remote machine destination directory.
specis a quoted pair of strings. The first specifies the path of the source file (on the local machine) to copy. The second, specifies the destination directory (on the remote machine):
tsshbatch.py -P "/foo/bar/baz /tmp" -i hostlist
/foo/bar/bazon the local machine to
/tmp/on every host in
-S Force prompting for
-T seconds Set timeout for ssh connection attempts. (Default: 15 seconds) -W
Print out a single line list of the inventory that would be processed and exit. (Test mode only - Ignored in execution mode.)
This allows you to embed
tsshbatchin external shell scripts like this:
for server in $(tsshbatch.py -i devserverlist -uatserverlist -W) do ssh $server done
Why? Because tsshbatch has lots of powerful ways to maintain inventories of hosts and combine them through includes and multiple command line arguments. The
-Woption makes it convenient for external programs to make use of those inventory features.
-a Don't abort program after failed file transfers. Continue to next transfer attempt. (Default: Abort) -b Don't abort program after failed
sudocommand. Normally, any
sudofailure causes immediate program termination. This switch tells
tsshbatchto continue processing on the next host even if such a failure occurs. This allows processing to continue for those hosts where
sudodoes work correctly. This is helpful in large environments where
sudois either improperly configured on some hosts or has a different password. This can also be used to discover where
sudodoes- and does not work correctly.
-e Don't report remote host
-f cmdfile Read commands from a file. This file can be commented freely with the
#character. Leading- and trailing whitespace on a line are ignored.
-h Print help information.
- -i hostfile(s) Specify which files to read to get a list of desired
hosts to target. This option may be repeated on the command line and may also be followed with a quoted list of such files. The following are equivalent:
tsshbatch.py -i devservers -i uatservers ... tsstbatch.py -i "devservers uatservers" ...
-ioptions can be freely combined and repated on the command line to create custom host lists made up of both known inventory and specific, individual hosts.
-k Use ssh keys instead of name/password credentials. -l logfile Log diagnostic output to
-n name Login name to use. -p pw Password to use when logging in and/or doing
-q Quiet mode - produce less noisy output. Turns off
-s Silence all program noise - only return command output. Applies only to command operations. File transfer and error reporting, generally, are unaffected. -t Test mode: Only show what would be done but don't actually do it. This also prints diagnostic information about any variable definitions, the list of hosts, any
PUTrequests, and final command strings after all variable substitutions have been applied. This is the default program behavior.
-v Print detailed program version information and exit. -x Override any previous
-tspecifications and actually execute the commands. This is useful if you want to put
$TSSHBATCHenvironment variable so that the default is always run the program in test mode. Then, when you're ready to actually run commands, you can override it with
-xon the command line.
-y Turn on 'noisy' reporting for additional detail on every line, instead of just at the top of the
stderrreporting. This is helpful when you are filtering the output through something like
grepthat only returns matching lines and thus no context information. Turns off
The last entry on the command line is optional and defines a command
tsshbatch will attempt to execute it on every host you've
specified either via
-H or a
tsshbatch.py -Hmyhost ls -al /etc
This will do a
ls -al /etc on
Be careful when using metacharacters like
&&, <<, >>, <, > and so
on in your commands. You have to escape and quote them properly or
your local shell will interfere with them being properly conveyed to
the remote machine.
If you've specified a
cmdfile containing the commands you want run via
-f option, these commands will run before the command
you've defined on the command line. It is always the last command
run on each host.
You can put as many
-f arguments as you wish on the command
line and the contents of these files will be run in the order
they appeared from left-to-right on the command line.
tsshbatch does all the
GETs, then all the
attempting to do any command processing. If no
commands have been specified,
tsshbatch will exit silently, since
"nothing to do" really isn't an error.
tsshbatch respects the
$TSSHBATCH environment variable. You
may set this variable with any options above you commonly use to avoid
having to key them in each time you run the program. For example:
export TSSHBATCH="-n jluser -p l00n3y"
This would cause all subsequent invocations of
attempt to use the login name/password credentials of
tsshbatch also supports searching for files over specified
paths with the
variables. Their use is described later in this document.
tsshbatch has limited support for ssh configuration files. Only the
IdentityFile directives are currently supported.
tsshbatch will look in
~/.ssh/config for this
configuration file. However, the location of the file can be
overriden with the
The sections below describe the various features of
more detail as well as common use scenarios.
There are two ways to specify the list of hosts on which you want to run the specified command:
On the command line via the
tsshbatch.py -H 'hostA hostB' uname -a
This would run the command
uname -aon the hosts
Notice that the list of hosts must be separated by spaces but passed as a single argument. Hence we enclose them in single quotes.
Via a host list file:
tsshbatch.py myhosts df -Ph
tsshbatchexpects the file
myhoststo contain a list of hosts, one per line, on which to run the command
df -Ph. As an example, if you want to target the hosts
myhostswould look like this:
larry.foo.com curly.foo.com moe.foo.com
This method is handy when there are standard "sets" of hosts on which you regularly work. For instance, you may wish to keep a host file list for each of your production hosts, each of your test hosts, each of your AIX hosts, and so on.
You may use the
#comment character freely throughout a host list file to add comments or temporarily comment out a particular host line.
You can even use the comment character to temporarily comment out one or most hosts in the list given to the
-Hcommand line argument. For example:
tsshbatch.py -H "foo #bar baz" ls
This would run the
lscommand on hosts
bar. This is handy if you want to use your shell's command line recall to save typing but only want to repeat the command for some of the hosts your originally Specified.
The simplest way to use
tsshbatch is to just name the hosts
can command you want to run:
tsshbatch.py linux-prod-hosts uptime
tsshbatch uses your login name found in the
environment variable when logging into other systems. In this
example, you'll be prompted only for your password which
will then use to log into each of the machines named in
linux-prod-hosts. (Notice that his assumes your name and
password are the same on each host!)
Typing in your login credentials all the time can get tedious after
tsshbatch provides a means of providing them on the
tsshbatch.py -n joe.luser -p my_weak_pw linux-prod-hosts uptime
This allows you to use
tsshbatch inside scripts for hands-free
If your login name is the same on all hosts, you can simplify this further by defining it in the environment variable:
export TSSHBATCH="-n joe.luser"
Any subsequent invocation of
tsshbatch will only require a
password to run.
HOWEVER, there is a huge downside to this - your plain text password
is exposed in your scripts, on the command line, and possibly your
command history. This is a pretty big security hole, especially if
you're an administrator with extensive privileges. (This is why the
ssh program does not support such an option.) For this reason, it
is strongly recommended that you use the
-p option sparingly, or
not at all. A better way is to push ssh keys to every machine and use
key exchange authentication as described below.
However, there are times when you do have use an explicit password,
such as when doing
sudo invocations. It would be really nice to
-p and avoid having to constantly type in the password. There
are two strategies for doing this more securely than just entering it
in plain text on the command line:
Temporarily store it in the environment variable:
export TSSHBATCH="-n joe.luser -p my_weak_pw"
Do this interactively after you log in, not from a script (otherwise you'd just be storing the plain text password in a different script). The environment variable will persist as long as you're logged in and disappear when you log out.
If you use this just make sure to observe three security precautions:
- Clear your screen immediately after doing this so no one walking by can see the password you just entered.
- Configure your shell history system to ignore commands beginning with
export TSSHBATCH. That way your plain text password will never appear in the shell command history.
- Make sure you don't leave a logged in session unlocked so that other users could walk up and see your password by displaying the environment.
This approach is best when you want your login credentials available for the duration of an entire login session.
Store your password in an encrypted file and decrypt it inline.
First, you have to store your password in an encrypted format. There are several ways to do this, but
gpgis commonly used:
echo "my_weak_pw" | gpg -c >mysecretpw
Provide a decrypt passphrase, and you're done.
Now, you can use this by decrypting it inline as needed:
#!/bin/sh # A demo scripted use of tsshbatch with CLI password passing MYPW=`cat mysecretpw | gpg` # User will be prompted for unlock passphrase tsshbatch.py -n joe.luser -p $MYPW -i hostlist1 command1 arg tsshbatch.py -n joe.luser -p $MYPW -i hostlist2 command2 arg tsshbatch.py -n joe.luser -p $MYPW -i hostlist3 command3 arg
This approach is best when you want your login credentials available for the duration of the execution of a script. It does require the user to type in a passphrase to unlock the encrypted password file, but your plain text password never appears in the wild.
For most applications of
tsshbatch, it is much simpler to use
key-based authentication. For this to work, you must first have
pushed ssh keys to all your hosts. You then instruct
use key-based authentication rather than name and password. Not only
does this eliminate the need to constantly provide name and password,
it also eliminates passing a plain text password on the command line
and is thus far more secure. This also overcomes the problem of
having different name/password credentials on different hosts.
tsshbatch will prompt for name and password if they
are not provided on the command line. To force key- authentication,
tsshbatch.py -k AIX-prod-hosts ls -al
This is so common that you may want to set it in your
environment variable so that keys are used by default. If you do
this, there may still be times when you want for force prompting for
passwords rather than using keys. You can do this with the
option which effectively overrides any prior
tsshbatch is smart enough to handle commands that begin with the
sudo command. It knows that such commands require a password no
matter how you initially authenticate to get into the system. If you
provide a password - either via interactive entry or the
option - by default,
tsshbatch will use that same password for
If you provide no password - you're using
-k and have not provided
a password via
tsshbatch will prompt you for the password
sudo should use.
You can force
tsshbatch to ask you for a
sudo password with
-S option. This allows you to have one password for initial
login, and a different one for
Any time you a prompted for a
sudo password and a login password
has been provided (interactive or
-p), you can accept this as the
sudo password by just hitting
tsshbatch makes a reasonable effort to scan your command
line and/or command file contents to spot explicit
invocations of the form
sudo .... It will ignore these
if they are inside single- or double quoted strings, on the
assumption that you're quoting the literal string
... for some other purpose.
However, this is not perfect because it is not a full
reimplementation of the shell quoting and aliasing features.
For example, if you invoke an alias on the remote machine
that resolves to a
sudo command, or you run a script
sudo command in it,
tsshbatch has no way to
determine what you're trying to do. For complex
applications, it's best to write a true shell script, push
it all the machines in question via
-P, and then have
tsshbatch remotely invoke it with
sudo myscript or
As always, the best way to figure out what the program thinks you're asking for is to run it in test mode and look at the diagnostic output.
tsshbatch supports these various authentication options in a
particular heirarchy using a "first match wins" scheme. From highest
to lowest, the precedence is:
- Key exchange
- Forced prompting for name via -N. Notice this cancels any previously requested key exchange authentication.
- Command Line/$TSSHBATCH environment variable sets name
- Name picked up from $USER (Default behavior)
If you try to use Key Exchange and
tsshbatch detects a command
sudo, it will prompt you for a password anyway.
This is because
sudo requires a password to promote privilege.
-P options specify file
respectively. Both are followed by a quoted file transfer
specification in the form:
Note that this means the file will always be stored under its original name in the destination directory. Renaming isn't possible during file transfer.
tsshbatch always does
PUTs then any
outstanding command (if any) at the end of the command line. This
permits things like renaming on the remote machine after a
tsshbatch.py -P "foo ./" -i hostlist mv -v foo foo.has.a.new.name
GETs are a bit of a different story because you are retrieving a
file of the same name on every host. To avoid having all but the last
one clobber the previous one,
tsshbatch makes forces the files you
GET to be uniquely named by prepending the hostname and a "-" to
the actual file name:
tsshbatch.py -H myhost -G "foo ./"
This saves the file
myhost-foo in the
./ on your a local
These commands do not recognize any special directory shortcut symbols
~/ like the shell interpreter might. You must name file and
directory locations using ordinary pathing conventions. You can put
as many of these requests on the command line as you like to enable
PUTs of multiple files. You cannot, however, use
filename wildcards to specify multi-file operations.
You can put multiple
PUTs on the command line for the
same file. They do not override each other but are cummulative. So
tsshbatch.py -P"foo ./" -P"foo /tmp" ...
Would put local file
foo in both
/tmp on each host
specified. Similarly, you can specify multiple files to
remote hosts and place them in the same local directory:
tsshbatch.py -G"/etc/fstab ./tmp" -G"/etc/rc.conf ./tmp" ...
You may also put file transfer specifications into a
.putfile directives. This is handy when you
have many to do and don't want to clutter up the command line. Each
must be on its own line in the
cmdfile and in the same form as if
it were provided on the command line:
.getfile /path/to/srcfile destdir # This will get a file .putfile /path/to/srcfile destdir # This will put a file
File transfers are done in the order they appear. For instance, if
you have a file transfer specification on the command line and then
make reference to a
cmdfile with a file transfer specification in
it, the one on the command line gets done first.
Keep in mind that
tsshbatch always processes file
transfers before executing any commands, no matter what
order they appear in the
cmdfile. If you have this in a
echo "Test" .putfile "./myfile /foo/bar/baz/"
The file will be transferred before the
gets run. This can be counterintuitive. It's therefore
recommended that you put your file transfers into a single
.include it as the first thing in your
cmdfile to make it obvious that these will be run first.
tsshbatch aborts if any file transfer fails. This is
unlike the case of failed commands which are reported but do not
abort the program. The rationale' for this is that you may be doing
both file transfer and command execution with a single
invocation, and the commands may depend on a file being transfered
If you are sure no such problem exists, you can use the
to disable abort-after-failure semantics on file transfer. In this
case, file transfer errors will be reported, but
continue on to the next transfer request.
tsshbatch does preserve permissions when transferring files.
Obviously, for this to work, the destination has to be writable by the
ID you're logging in with.
The file transfer logic cannot cope with filenames that contain spaces. The workaround is to either temporarily rename them, or put them in a container like a tarball or zip file and transfer that instead.
hostlistfile can be freely commented
# character. Everything from that character to the end
of that line is ignored. Similarly, you can use whitespace freely,
except in cases where it would change the syntax of a command or host
You may also include other files as you wish with the
filename directive anywhere in the
This is useful for breaking up long lists of things into smaller
parts. For example, suppose you have three host lists, one for each
major production areas of your network:
hosts-development hosts-stage host-production
You might typically run different
tsshbatch jobs on each of these
sets of hosts. But suppose you now want to run a job on all of them.
Instead of copying them all into a master file (which would be
instantly obsolete if you changed anything in one of the above files),
you could create
hosts-all with this content:
.include hosts-development .include hosts-stage .include hosts-production
that way if you edited any of the underlying files, the
hosts-all would reflect the change.
Similarly you can do the same thing with the
cmdfile to group
similar commands into separate files and include them.
tsshbatch does not enforce a limit on how deeply nested
.includes can be. An included file can include another file and
so on. However, if a circular include is detected, the program will
notify you and abort. This happens if, say, file1 includes file2,
file2 includes file3, and file3 includes file1. This would create an
infinite loop of includes if permitted. You can, of course, include
the same file multiple times, either in a single file or throughout
other included files, so long as no circular include is created.
tsshbatch supports the ablity to search paths to find files you've
referenced. The search path for
cmdfiles is specified in the
$TSSHBATCHCMDS environment variable. The
path is specified in the
$TSSHBATCHHOSTS environment variable.
These are both in standard path delimited format for your operating
system. For example, on Unix-like systems these look like this:
And so forth.
These paths are honored both for any files you specify on the command
line as well as for any files you reference in a
directive. This allows you to maintain libraries of standard commands
and host lists in well known locations and
.include the ones you
tsshbatch will always first check to see if a file you've
specified is in your local (invoking) directory and/or whether it is a
fully qualified file name before attempting to look down a search
path. If a file exist in several locations, the first instance found
"wins". So, for instance, if you have a file called
somewhere in the path defined in
$TSSHBATCHHOSTS, you can override
it by creating a file of same name in your current working directory.
tsshbatch also checks for so-called "circular includes" which
would cause an infinite inclusion loop. It will abort upon
discovering this, prior to any file transfers or commands being
As you become more sophisticated in your use of
begin to see the same patterns of use over and over again. Variables
are a way for you to use "shortcuts" to reference long strings
without having to type the whole string in every time. So, for example,
instead of having to type in a command like this:
myfinecommand -X -Y -x because this is a really long string
You can just define variable like this:
.define __MYCMD__ = myfinecommand -X -Y -x because this is a really long string
From then on, instead of typing in that long command on the command line or in
a command file, you can just use
tsshbatch will substitute
the string as you defined it whenever it encounters the variable.
Variables can be used pretty much everwhere:
hostlistfilesor in the hostnames listed with
.define __MYDOMAIN__ = stage.mydomain.com #.define __MYDOMAIN__ = prod.mydomain.com host1.__MYDOMAIN__ host2.__MYDOMAIN__
Now you can switch
tsshbatchoperation from stage to prod simply by changing what is commented out at the beginning.
In file transfer specifications:
tsshbatch.py -xP"./fstab-__MYHOSTNAME__ ./" -i hostlist tsshbatch.py -xG"/etc/__OSNAME__-release ./" -i hostlist
.define __SHELL__ = /usr/local/bin/bash __SHELL__ -c myfinescript
A variable can have pretty much any name you like excepting
the use of metacharacters like
!. But if
you are not careful, you can cause unintended errors:
.define foo = Slop myfoodserver.foods.com
When you run
tsshbatch it will then turn the server name
mySlopdserver.Slopds.com - probably not what you
So, it's a Really Good Idea (tm) to use some kind of naming scheme to make variables names stand out and make them unlikely to conflict accidentally with command- and host strings.
tsshbatch has three different kinds of variables:
- User Defined Variables are the kind in the example above. You, the user, define them as you wish in a
- Execution Variables run any program or script of your choosing (on the same machine you're running
tsshbatch) and assign the results to a variable.
- Builtin Variables are variables the
tsshbatchitself defines. You can override their default values by creating a User Defined Variable of the same name.
User Defined and Execution Variables are defined in either a
Builtin Variables are defined within
tsshbatch itself unless you
User Defined Variables are all read in and then used. If you do something like this:
.define __FOO__ = firstfoo echo __FOO__ .define __FOO__ = secondfoo
You'll get an output of ...
secondfoo! Why? Because before
tsshbatch tries to run anything, it has to process all the
hostlistfile, and the command line content. So,
before we ever get around to doing an
echo __FOO__ on some host,
the second definition of __FOO__ has been read in ... and last
Execution Variables are like User Defined Variables. They get
processed a single time at the time they're read in from a
Builtin Variables get evaluated every time ``tsshbatch`` prepares to connect to a new host (unless you've overriden them). That way, the most current value for them is available for use on the next host.
Keep in mind that
tsshbatch isn't a programming language. It's
"variables" are simple string substitutions with "last one wins"
semantics. There is no notion of scope, for example. If you define
the same variable in, say, a
cmdfile and also in the
hostlistfile, the latter will "win". Why? Because
hostlistfiles are always read in after any
Finally, variable references in a definition are ignored. Say you
do this in a
.define __CLEVER __ = __REALLYCLEVER__ .define __REALLYCLEVER__ = Not That Smart echo __CLEVER__
You will get this output,
__REALLYCLEVER__! Why? Because, the
variable references on the right side of a definition statement are
never replaced. This is a concious design choice to keep variable
definition and use as simple and obvious as possible. Allowing such
"indirect" definitions opens up a treasure trove of maintenance pain
you really want to avoid. Trust us on this one.
tsshbatch allows you to define variables which will then be used
to replace matching strings in
file transfer specifications. For example, suppose you have this in a
.define DOMAIN=.my.own.domain.com host1DOMAIN host2DOMAIN host3DOMAIN
At runtime, the program will actually connect to
host2.my.domain.com, and so on. This
allows for ease of modularization and maintenance of your files.
Similarly, you might want define
MYCMD=some_long_string so you
don't have to type
some_long_string over and over again in a
There are some "gotchas" to this:
The general form of a variable definition is:
.define name = value
You have to have a name but the value is optional.
.define FOO=simply replaces any subsequent
FOOstrings with nothing, effectively removing them.
=symbols to the right of the one right after
nameare just considered part of the variable's value.
Whitespace around the
=symbol is optional but allowed.
Variables are substituted in the order they appear:
.define LS = ls -alr LS /etc # ls -alr /etc .define LS = ls -1 LS /foo # ls -1 /foo
Variable names and values are case sensitive.
Variables may be defined in either
hostlistfilesbut they are visible to any subsequent file that gets read. For instance,
cmdfilesare read before any
hostlistfiles. Any variables you've defined in a
cmdfilethat happen to match a string in one of your hostnames will be substituted.
This is usually not what you want, so be careful. One way to manage this is to use variables names that are highly unlikely to ever show up in a hostname or command. That way your commands and hostnames will not accidentally get substrings replaced with variable values. For example, you might use variable names like
Variable substitution is also performed on any host names or commands passed on the command line.
Execution Variables are actually a special case of User Defined Variables. That is, they are evaluated at the same time and in the same manner as any other User Defined Variable. The difference is that a User Defined Variable describes a literal string replacement. But an Execution Variable runs a command, program, or script and assigns the results to the variable.
For example, suppose you want create a file on many machines, and you
want that file to be named based on who ran the
You might do this in a
.define __WHOAMI__ = ! whoami touch __WHOAMI__-Put_This_Here.txt
So, if ID
luser is running
tsshbatch, a file called
luser-Put_This_Here.txt will be created (or have its timestamp
updated) on every machine in the
hostlistfile or named with
Notice it is the
! character that distinguishes an Execution
Variable from a User Defined Variable. It is this character that
tsshbatch, "Go run the command to the right of me and return
the results." The trailing space is optional and the definition could
be written as:
.define __WHOAMI__ = !whoami
If the command you specify returns multiple lines of output, it's up
to you to process it properly.
tsshbatch does no newline
stripping or other postprocessing of the command results. This can
make the output really "noisy".
tssbatch normally reports
a summary of the command and its results. But if you do something
.define __LS__ = ! ls -al echo __LS__
You will get a multiline summary of the command and then the actual
output - which is also multiline. This gets to be obnonxious pretty
quickly. You can make a lot of this go away with the
It's important to remember that the program you are invoking
runs on the same machine as
tsshbatch itself, NOT each
host you are sending commands to. In other words, just
like Builtin Variables, Execution Variables are locally
As noted previously, Builtin Variables are created by
itself. They are created for each new host connection so that things
like time, host number, and hostname are up-to-date.
As of this release,
tsshbatch supports the following Builtins:
Date in YYYYMMDD format
Date and time in YYYYMMDDHHMMSS format
Full name of current host as passed to
Count of host being processed, starting at 1
Leftmost component of hostname as passed to
User name used for remote login. For key auth, name of tsshbatch user.
Time in HHMMSS format
There are times when it's convenient to be able to embed the name of
the current host in either a command or in a file transfer
specification. For example, suppose you want to use a single
tsshbatch to transfer files in a host-specific way.
You might name your files like this:
Now, all you have to do is this:
tsshbatch.py -xH "host 1 host2" -P "myfile.__HOSTNAME__ ./"
tsshbatch will substitute the name of the current host
in place of the string
__HOSTNAME__. (Note that these are
**double* underbars on each side of the string.*)
You can do this in commands (and commands within command files) as well:
tsshbatch.py -x hosts 'echo I am running on __HOSTNAME__'
Be careful to escape and quote things properly, especially from the
the command line, since
> are recognized by the shell as
There are two forms of host name substitution possible. The first,
__HOSTNAME__ will use the name as you provided it, either as an
-H or from within a host file.
__HOSTSHORT__, will only use the portion of the name
string you provided up to the leftmost period.
So, if you specify
__HOSTNAME__ will be
replaced with that entire string, and
__HOSTSHORT__ will be
replaced by just
Notice that, in no case does
tsshbatch do any DNS lookups to
figure this stuff out. It just manipulates the strings you provide as
__HOSTSHORT__ are like any other
symbol you might have specified yourself with
means you can override their meaning. For instance, say you're doing
tsshbatch.py -x myhosts echo "It is: __HOSTNAME__"
As you would expect, the program will log into that host, echo the hostname and exit. But suppose you don't want it to echo something else for whatever reason. You'd create a command file with this entry:
.define __HOSTNAME__ = Really A Different Name
Now, when you run the command above, the output is:
It is: Really A Different Name
In other words,
.define has a higher precedence than the
preconfigured values of
tsshbatch defaults to a medium level of reporting as it runs.
This includes connection reporting, headers describing the command
being run on every host,and the results written to
stdout. Each line of reporting output begins with
help you parse through the output if you happen to be writing a
program that post-processes the results from
This output "noise" is judged to be right for most applications of the
program. There are times, however, when you want more- or less
"noise" in the output. There are several
tsshbatch options that
These options only affect reporting of commands you're running. They do not change the output of file transfer operations. They also do not change error reporting, which is always the same irrespective of current noise level setting.
-q or "quiet" mode, reduces the amount of output noise in
two ways. First, it silences reporting each time a successful
connection is made to a host. Secondly, the command being run
isn't reported in the header. For example, normally, running
ls -l is reported like this:
---> myhost: SUCCESS: Connection Established ---> myhost (stdout) [ls -l]: ... ---> myhost (stderr) [ls -l]:
In quiet mode, reporting looks like this:
---> localhost (stdout): ... ---> localhost (stderr):
The main reason for this is that some commands can be very long. With execution variables, it's possible to create commands that span many lines. The quiet option gives you the ability to suppress echoing these long commands for each and every host in your list.
-y or "noisy" mode, produces normal output noise but
also replicates the hostname and command string for
every line of output produced. For instance,
might normally produce this:
---> myhost: SUCCESS: Connection Established ---> myhost (stdout) [ls -1]: backups bin
But in noisy mode, you see this:
---> myhost: SUCCESS: Connection Established ---> myhost (stdout) [ls -1]: [myhost (stdout) [ls -1]] backups [myhost (stdout) [ls -1]] bin
Again, the purpose here is to support post-processing where you might want to search through a large amount of output looking only for results from particular hosts or commands.
-s or "silent" mode returns only the results from running the
commands. No headers or descriptive information are produced. It's
more-or-less what you'd see if you logged into the host and ran the
command interactively. For instance,
ls -l might look like this:
total 44 drwxr-xr-x 2 splot splot 4096 Nov 5 14:54 Desktop drwxrwxr-x 39 splot splot 4096 Sep 9 14:57 Dev drwxr-xr-x 3 splot splot 4096 Jun 14 2012 Documents
The idea here is to use silent mode with the various variables
described previously to customize your own reporting output. Imagine
you have this in a
cmdfile and you run
tsshbatch in silent
.define __USER__ = ! echo $USER echo "Run on __HOSTNAME__ on __DATE__ at __TIME__ by __USER__" uname -a
You'd see output along these lines:
Run on myhost on 20991208 at 141659 by splot Linux myhost 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Comments can go anywhere.
.include must be the first
non-whitespace text on the left end of a line. If you do this in a
foo .include bar
tsshbatch thinks you want to run the command
foo with an
.include bar. If you do it in a
the program thinks you're trying to contact a host called
.include bar. In neither case is this likely to be quite what you
had in mind. Similarly, everything to the right of the directive is
considered its argument (up to any comment character).
Whitespace is not significant at the beginning or end of a line but
it is preserved within
arguments as well as within commmand definitions.
Strictly speaking, you do not have to have whitespace after a directive. This is recognized:
But this is strongly discouraged because it's really hard to read.
tsshbatch writes the
stdout of the remote host(s) to
stdout on the local machine. It similarly writes remote
stderr output to the local machine's
stderr. If you wish to
stderr output, either redirect it on your local command
line or use the
-e option to turn it off entirely. If you want
everything to go to your local
stdout, use the
You must have a reasonably current version of Python 2.x installed.
It almost certainly will not work on Python 3.x because it uses the
commands module. This decision was made to make the
program as backward compatible with older versions of Python as
possible (there is way more 2.x around than there is 3.x).
If your Python installation does not install
have to install it manually, since
tsshbatch requires these
libraries as well.
tsshbatch has been run extensively from Unix-like systems (Linux,
FreeBSD) and has had no testing whatsoever on Microsoft Windows. If
you have experience using it on Windows, do please share with the
class using the email address below. While we do not officially
support this tool on Windows, if the changes needed to make it work
properly are small enough, we'd consider updating the code
You will not be able to run remote
sudo commands if the host in
question enables the
Defaults requiretty in its
configuration. Some overzealous InfoSec folks seem to think this is
a brilliant way to secure your system (they're wrong) and there's
tsshbatch can do about it.
sudo is presented a bad password, it ordinarily prints a
string indicating something is wrong.
tsshbatch looks for this
to let you know that you've got a problem and then terminates
further operation. This is so that you do not attempt to log in
with a bad password across all the hosts you have targeted. (Many
enterprises have policies to lock out a user ID after some small
number of failed login/access attempts.)
However, some older versions of
sudo (noted on a RHEL 4 host
sudo 1.6.7p5) do not return any feedback when presented
with a bad password. This means that
tsshbatch cannot tell the
difference between a successful
sudo and a system waiting for
you to reenter a proper password. In this situation, if you enter a
bad password, the the program will hang. Why?
thinks nothing is wrong and waits for the
sudo command to
complete. At the same time,
sudo itself is waiting for an
updated password. In this case, you have to kill
start over. This typically requires you to put the program in
`Ctrl-Z in most shells) and then killing that job
from the command line.
There is no known workaround for this problem.
It's always interesting to see how other people approach the same
problem. If you're interested in this general area of IT automation,
you may want to also look at
tsshbatch is Copyright (c) 2011-2016 TundraWare Inc.
tsshbatch-license.txt file in the
program distribution. If you install tsshbatch on a FreeBSD
system using the 'ports' mechanism, you will also find this file in
Tim Daneliuk email@example.com
$Id: 'ba75286 tundra Fri Sep 30 15:59:00 2016 -0500'
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