The "" 1 2 3 15 are trap signals that unix interperets. Without looking in a book to tell you what each signal means. Basically it has to do with not allowing CTRL+C CTRL+~ etc... To disable them use the command trap 1 2 3 15 with out the "". I tend to use these commands in .profiles as well to stop uses breaking out to a shell prompt.
( "To become Wise, first you must ask Questions"
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