NAME
     pmlock - simple file-based mutex

SYNOPSIS
     $PCP_BINADM_DIR/pmlock [ -v ] file

DESCRIPTION
     pmlock attempts to acquire an exclusive lock by creating file with a mode
     of 0.

     The exit status is 0 for success, 1 for failure.

     To release the lock, unlink file.

     In the event of a failure, the -v option produces an explanatory message
     on stdout.

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