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Any shell command can be executed, using
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 12.2 Reading the output of commands if you need to process the
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
The builtin macro
syscmd is recognized only when given arguments.
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