First, standard output is redirected to /dev/null. Assuming 1 is standard output file descriptor & 2 is standard error, standard error is also redirected to the same place as standard output (which is to /dev/null).

Above will work only when a bourne-like shell (FreeBSD /bin/sh, bash, zsh, etc.) handles the redirection.

In reply to Re^4: how to supress stdout by parv
in thread how to supress stdout by chuckd

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