Print text at specified line number bash -

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I want to print text from a file to a specified line number.

Here's my bash script 

  line = 12 sed -n "$ line {p; q;}"

Line number comes in one variable but the above code is not working What should I do?

You must give the filename as the argument of sed . 

  line = 12 sed -n "$ line {p; q;}" filename

If you assign a file script to a single bidding script , You need to use: 

  line = 12 sed -n "$ line {p; q;}" "$ 1"

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