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Info Catalog
(m4.info) Arithmetic
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(m4.info) Miscellaneous
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
Info Catalog
(m4.info) Arithmetic
(m4.info) Top
(m4.info) Miscellaneous