GNU Info
Info Node: (m4.info)UNIX commands
(m4.info)UNIX commands
Running UNIX commands
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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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