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Re: upto match please, my one-lina!!

by roboticus (Chancellor)
on Jun 09, 2006 at 00:24 UTC ( #554392=note: print w/ replies, xml ) Need Help??


in reply to upto match please, my one-lina!!

Firefly258:

Howzabout this?

perl -ne 'print @t if /foo/; push @t,$_; shift @t if $#t>5' file
You can even slice @t in the print if you want to have a larger gap between the last printed item and the regular expression...

UPDATE: I golfed it down a little:

perl -ne 'print @t if /foo/; @t=(@t[1..4],$_)' file
--roboticus


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Re^2: upto match please, my one-lina!!
by jwkrahn (Monsignor) on Jun 09, 2006 at 03:56 UTC
    That doesn't print the "---\n" string or the correct lines. You want something like:
    perl -ne'@t=(@t[1..4],$_);/regex/&&die@t,"---\n"' file
      D'oh!

      I was having so much fun playing with one-liners that I forgot the parameters of the problem. I love that die trick.... I'll have to try it:

      perl -ne '@t=(@t[1..4],$_,"---\n");die@t if/foo/' file
      --roboticus
        @t=(@t[1..4],$_,"---\n")
        You are adding two lines for every one line you remove so every second line will be "---\n".

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