unix_s - shell (sh) command execution, no output
Sends a string cmd to Unix for execution by the sh shell. The standard output is redirected to /dev/null. Unix execution errors are trapped; *NOTE* that only the last shell command error is reported when a list of command separated by ";" is sent: this is not recommended.
if MSDOS then unix_s("del foo"); else unix_s("rm -f foo"); end
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