[olug] grep.pl

[Sam Tetherow]

I doubt that is a restriction on GNU's grep.  It wouldn't suprise me 
coming from AIX though.  I went through much the same problem on Solaris 
with head and tail and ended up installing the GNU implementations.

Jay Hannah wrote:
> AIX's GNU(?) utilities bite. Case in point: grep has a 2048 character line
> limit. So, we're trying to grep big ugly logs and grep isn't working.
> Then, just today, we hit a frustrating problem where grep is buffering
> output, waiting for certain buffer sizes before printing. Well, that's
> fine most of the time, but it wasn't fine today and there was no way to
> tell AIX's grep not to do that.
> 
> So, I wrote grep.pl. It works where our AIX grep fails. I added a -n
> switch 'cause I needed that today. I could add other handy switches if I
> ever needed them (-l, -v -ponder-)...
> 
> Demo:
> $ cat letters
> a
> b
> c
> d
> e
> f
> $ grep.pl c letters
> c
> $ grep.pl -n c letters
> 3: c
> $ cat letters | grep.pl c
> c
> $ cat letters | grep.pl -n c
> 3: c
> 
> The code:
> #!/usr/bin/perl
> 
> use Getopt::Long;
> use FileHandle;
> STDOUT->autoflush;
> STDERR->autoflush;
> 
> GetOptions (
>    'n' => \$n
> );
> 
> my $searchfor = shift;
> while (<>) {
>    $line_number++;
>    next unless (/$searchfor/i);
>    $line = $_;
>    if ($n) {
>       print "$line_number: ";
>    }
>    print $line;
> }
> 
> Comments:
> - Getopt::Long is cool.
> - <> is cool and magically delicious
> - Perl is cool.
> 
> j
> Omaha Perl Mongers: http://omaha.pm.org
> 
> 
> 
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> 


-- 
------------------------------------------------------------------------
Sam Tetherow                           tetherow at nicusa.com
Director of Development
NIC Labs (PSSG)                        http://www.nicusa.com