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Linux in a Nutshell, Fourth Edition by Aaron Weber, Stephen Figgins, Ellen Siever

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Name

pidof

Synopsis

                  pidof [options] programs
               

Display the process IDs of the listed program or programs. pidof is actually a symbolic link to killall5.

Options

-o pids

Omit all processes with the specified process IDs.

-s

Return a single process ID.

-x

Also return process IDs of shells running the named scripts.

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