Create a pidof command to find PID numbers easily

Most UNIX environments include the pidof command which is put to use whenever one needs to quickly determine, by name, the pid of a running program. Apple's Mac OS X lacks the pidof command, however, one may approximate its function with the following shell script:

#!/bin/sh ps axc|awk "{if ($5=="$1") print $1}";

Save the script as /bin/pidof and be sure to set its executable bit:

chmod a+x /bin/pidof