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Prints exactly 15th line of $file. You can also specify a range:
sed -n '2,18p' $file - this will print lines 2 to 18, inclusive.
There are 6 alternatives - vote for the best!
This is not printing, real editing using the text editor.
Nth line of a file - dirty hack way. I haven't used ed in ages ;-)
Silly approach, but easy to remember...
If you can do better, submit your command here.
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