(m4.info.gz) UNIX commands

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 Running UNIX commands
 *********************
 
    There are a few builtin macros in `m4' that allow you to run UNIX
 commands from within `m4'.
 

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* Syscmd                      Executing simple commands
* Esyscmd                     Reading the output of commands
* Sysval                      Exit codes
* Maketemp                    Making names for temporary files
 

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