GNU Info

(m4.info)UNIX commands

---

Next: Miscellaneous Prev: Arithmetic Up: Top

---

Enter node , (file) or (file)node

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