Help with exit, grep, temporary files, awk

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http://www.unix.com – 1. The problem statement, all variables and given/known data:I do not understand how/why the following code is used. Please do not simply refer me to the man pages since I have already reviewed them extensively. Thank you. exit 2 , exit 3, exit 0 I understand the basics of why the exit command is used, but I still don't understand what the significance/meaning of exit 2, exit 3, and exit 0 are.The creation (and later deletion) of a temporary fileI understand that creation of the temporary file is used to print the contents of the following commands within that file so the grep command can (HowTos)