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--unix option.
Any shell command can be executed, using \syscmd:
\syscmd{shell-command}
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which executes shell-command as a shell command.
If you want T4 to read the output of a UNIX command, use \esyscmd:
\esyscmd{shell-command}
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which expands to the standard output of the shell command shell-command.
To see whether a shell command succeeded, use \sysval:
\sysval |
which expands to the exit status of the last shell command run with
\syscmd or \esyscmd.