awk script to parse output of ps command

I have never worked on programming languages before. I am learning C and unix architecture by refering online links. I got small exercise to write awk script to parse output of ps command. please help and please provide me the names of best books for C & awk scripting开发者_高级运维.

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Lets say you want to list just the command column(8th column) from the ps -ef output, you can do:

ps -ef | awk '{print $8}'