http://www.perlmonks.org?node_id=680334


in reply to Re: using perl to format tail -f
in thread using perl to format tail -f

Or to a script: 
#!/usr/bin/env perl
use warnings;
use strict;

while(<>) {
 #... do something with the latest line, $_
}

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Usage: 
tail -f /var/log/apache2/access.log | myscript.pl

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In Section Seekers of Perl Wisdom