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Prints the 4th line and then quits. (Credit goes to flatcap in comments: http://www.commandlinefu.com/commands/view/6031/print-just-line-4-from-a-textfile#comment.)
There are 9 alternatives - vote for the best!
this method should be the fastest
using tail first won't do it because tail counts from the bottom of the file. You could do it this way but I don't suggest it
d --> delete
!d ---> delete others
Perl version - just for completeness sake ;)
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