I have a table and my goal is to do a unix style:
grep 'pattern' file.txt >tofile.txt
I would like the pattern to depend on the unique values in the 1 column. Final goal is to get a print to various files named after the unique values. I haven't been able to figure out how. It my first attempt in Perl.
Thanks for any feedback,
Gert 
use strict;
use diagnostics;
use warnings;

use vars qw! $file $col @F $val $count @order %count $i !;
my $file = $ARGV[0];
open( INPUT, $file ) || die "does not work: $!";
$col = 0;
while (<INPUT>) {
    s/\r?\n//;
    @F = split /,/, $_;
    $val = $F[$col];
    if ( !exists $count{$val} ) { push @order, $val }
    $count{$val}++;
}
foreach $val (@order) { print "$val\n" }
close(INPUT);
open( INPUT, $file ) || die "does not work: $!";
open( MYFILE, ">printhere.txt" ) or die "does not work $!";
    while (<INPUT>) {
    {
        for ( $i = 0 ; $i < scalar @order ; $i++ ) {
            if (m/^$order[$i]/) { print MYFILE }
        }
    }
}
close(INPUT);
close(MYFILE);

[download]

In reply to Split up file depending unique values 1st column by GertMT

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.