Shell Scripting Help

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http://www.unix.com – Hi, I am very new to shell scripting and I need to create a shell script that would keep track of inventory from a csv file. So if someone orders something online the program will subtract that item that way they can't sell more than they actually have. I have no idea where to begin like I said I am extremely new to shell scripting. Any help is very much appreciated.. Thank you. (HowTos)