diff --git a/tren.py b/tren.py
index d949f55..77238f2 100755
--- a/tren.py
+++ b/tren.py
@@ -8,7 +8,7 @@
 PROGNAME = "tren.py"
 BASENAME = PROGNAME.split(".py")[0]
 PROGENV  = BASENAME.upper()
-RCSID = "$Id: tren.py,v 1.166 2010/03/05 21:54:36 tundra Exp $"
+RCSID = "$Id: tren.py,v 1.167 2010/03/06 01:18:02 tundra Exp $"
 VERSION = RCSID.split()[2]
 
 # Copyright Information
@@ -104,8 +104,9 @@
 # Replacement Token Literals
 #####
 
-TOKENDELIM   =  "/"           # Symbol used to delimit renaming tokens
-TOKENENV     =  "$"           # Environment variable token
+TOKENCMDEXEC =  "`"           # Delimiter for command execution renaming tokens
+TOKENDELIM   =  "/"           # Delimiter for all renaming tokens
+TOKENENV     =  "$"           # Introducer for environment variable replacement tokens
 
 
 # Internal program state literals
@@ -184,6 +185,7 @@
 eBADRENAMETOK =  "Renaming token missing delimiter: %s"
 eBADREGEX     =  "Invalid Regular Expression: %s"
 eERROR        =  "ERROR"
+eEXECFAIL     =  "Command: '%s' Failed To Execute!"
 eFILEOPEN     =  "Cannot open file '%s': %s!"
 eLINELEN      =  "Specified line length too short!  Must be at least %s" % MINLEN
 eNAMELONG     =  "Renaming '%s' to new name '%s' too long! (Maximum length is %s.)"
@@ -710,11 +712,43 @@
 
         for r in rentokens:
 
-            # Environment variable replacement token
+            # Environment Variable replacement token
             
             if r[2].startswith(TOKENENV):
                 r[2] = os.getenv(r[2][1:])
             
+            # Command Run replacement token
+
+            elif r[2].startswith(TOKENCMDEXEC) and r[2].endswith(TOKENCMDEXEC):
+
+                command = r[2][1:-1]
+
+                # Handle Windows variants which act differently
+
+                if os.name != 'posix':
+                    pipe = os.popen(command, 'r')
+
+                # Handle Unix variants
+
+                else: 
+                    pipe = os.popen('{ ' + command + '; } 2>&1', 'r')
+
+                output = pipe.read()
+                status = pipe.close()
+
+                if status == None:
+                    status = 0
+
+                # Nonzero status means error attempting to execute the command
+                    
+                if status:
+                    ErrorMsg(eEXECFAIL % command)
+
+                # Otherwise swap the command with its results, stripping newlines
+                    
+                else:
+                    r[2] = output.replace("\n", "")
+                    
             # Do the actual replacement
 
             renstring = renstring[:r[0]] + r[2] + renstring[r[1]+1:]