Finding Running Process ID's On Linux Using Pidof

[ Thanks to Mike Golvach for this link. ]

"The "-x" option is good for hunting down what shell is running what script. You can usually find this out by backtracing the PID from child to parent and so forth, by running "file" against the script itself or just checking your ps output. In the case where you have a script, showing up in your process table, that doesn't have an obvious point of origin for you to examine, this option is a pretty quick way to figure out the invoking shell."

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