(m4.info) Syscmd

 
 Executing simple commands
 =========================
 
    Any shell command can be executed, using `syscmd':
 
      syscmd(SHELL-COMMAND)
 
 which executes SHELL-COMMAND as a shell command.
 
    The expansion of `syscmd' is void, *not* the output from
 SHELL-COMMAND!  Output or error messages from SHELL-COMMAND are not
 read by `m4'.   Esyscmd if you need to process the command
 output.
 
    Prior to executing the command, `m4' flushes its output buffers.
 The default standard input, output and error of SHELL-COMMAND are the
 same as those of `m4'.
 
    The builtin macro `syscmd' is recognized only when given arguments.

Info Catalog

(m4.info) UNIX commands

(m4.info) Esyscmd

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