$ cat /var/mail/* >/dev/null 2>&1The first redirect sends stdout to /dev/null, the second one sends stderr to stdout, thus making all the output disappear. Useful in cron jobs if you want no mail sent.
cmd
Nix all output
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[...] versions of grep is desired… One should redirect all output to /dev/null, but we have already spoken about this, and it is likely that you do not need that compatibility in your new home-made scripts. [...]