commandline session $> 1 $flock 1 $ls 1 $echo 1 > 1 $cat 1 1 $ls -l total 4 -rw-r–r– 1 jeffrin jeffrin 2 Aug 11 18:24 1 $flock -n 1 $echo 1 > 1 $ls -l total 4 -rw-r–r– 1 jeffrin jeffrin 2 Aug 11 18:29 1 $1 /var/loc local/ lock/ $1> /var/lock/mylock $cat …