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Info Node: (m4.info)UNIX commands

(m4.info)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'.

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

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