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Perl: the Markov chain saw

Re: Search file for certain lines

by mtmcc (Hermit)
on Sep 23, 2013 at 09:48 UTC ( #1055257=note: print w/replies, xml ) Need Help??

in reply to Search file for certain lines

I'm not entirely sure what you're trying to do. Surely, all lines in your file will be between two lines beginning with h, aside from those before the first line beginning with h, and after the last line beginning with h?

It might make it easier to understand the problem if you give some sample data, and the result you expect to get. Have a look through this: How do I post a question effectively?

Finally, based on your question, my best guess would be something like this:

#!/usr/bin/perl use strict; use warnings; my $file = $ARGV[0]; my $check = 0; my @line; while (<DATA>) { @line = split('', $_); $check += 1 if $line[0] eq 'h'; if ($check%2 == 1) { if (($line[0] eq 'j') || ($line[0] eq 'E') || ($line[0 +] eq 'G')) { print STDOUT "$_"; } } } __DATA__ aaaaa 1 bbbbb 2 hhhhh 3 fffff 4 rrrrr 5 lllll 6 jjjjj 7 HHHHH 8 EEEEE 9 GGGGG 10 hhhhh 11 jjjjj 12 EEEEE 13 GGGGG 14

I hope that helps.

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