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. See section Reading the output of commands 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.
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