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Re^2: Watch log for string (tail -f)

by hmb104 (Sexton)
on Oct 11, 2012 at 20:25 UTC ( #998535=note: print w/replies, xml ) Need Help??

in reply to Re: Watch log for string (tail -f)
in thread Watch log for string (tail -f)

lol, yes it keep going and going and going. Any ideas about how to make it exit once 3 occurrences are cough in the tail -f command?

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Re^3: Watch log for string (tail -f)
by BrowserUk (Pope) on Oct 11, 2012 at 20:45 UTC

    tail -f doesn't end until you interrupt it. Try something like this:

    #! perl -slw use strict; my $pid = open TAIL, '-|', 'tail -f theLog' or die $!; my @matches; while( @matched <3 and defined( $_ = <TAIL> ) ) { push @matches, $_ if /the search term/; } kill 2, $pid; ## do something with the 3 lines in @matches.

    With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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      Try this, May this will help

      use File::Tail; sub reading_updated_file { my $path=shift; my $count=0; my $file=File::Tail->new($path); while(defined (my $read=$file->read)) { if($read =~ /string_to_match/) { $count++; last if $count ==3; } print "here doing rest statements"; } } &reading_updated_file("path of file_to tail");
      This just really helped me. Note that @matches is declared but is interchangeably used as @matched, apart from that, this is really useful - thanks :)

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