Get Specific Line From Text File Using Just Shell Script

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http://stackoverflow.com – I am trying to get a specific line from a text file. So far, online I have only seen stuff like sed, (I can only use the sh -not bash or sed or anything like that). I need to do this only using a basic shell script. cat file | while read line do #do something done I know how to iterate through lines, as shown above, but what if I just need to get the contents of a particular line (HowTos)