Info Catalog m4: Arithmetic m4: Top m4: Miscellaneous

m4: Shell commands

 
 13 Macros for running shell commands
 ************************************
 
 There are a few builtin macros in 'm4' that allow you to run shell
 commands from within 'm4'.
 
    Note that the definition of a valid shell command is system
 dependent.  On UNIX systems, this is the typical '/bin/sh'.  But on
 other systems, such as native Windows, the shell has a different syntax
 of commands that it understands.  Some examples in this chapter assume
 '/bin/sh', and also demonstrate how to quit early with a known exit
 value if this is not the case.
 

Menu

 
· Platform macros             Determining the platform
· Syscmd                      Executing simple commands
· Esyscmd                     Reading the output of commands
· Sysval                      Exit status
· Mkstemp                     Making temporary files
 

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