You haven't allowed for overlapping regions. If I want to print out any line matching "foo" plus the next 3 lines in the following 
qux
foo 
bar 1
bar 2
foo 
bar 1
bar 2
bar 3
qux

[download]

Then I'd want all the lines printed from the first "foo" to the last "bar", yours only prints up to the second "foo" line.

In reply to Re: Grep - print matched line and next N lines by Anonymous Monk
in thread Grep - print matched line and next N lines by runrig

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