Thank you. Your help has narrowed things down to one error message: "Use of uninitialized value $SKU in rr2.pl line 17, <myfile> line 287." The script does print the $sku information to the file too. 
#!/usr/bin/perl -w
use strict;
$| = 1;

my $myfile = "apr_products_tab.csv";
my $newfile = "./sku.txt";

open (myfile, "$myfile") || die "Cannot open $myfile, aborting program
+.";
open (newfile, "> $newfile") || die "Cannot open sku.txt, aborting pro
+gram. $!\n";

while (<myfile>)
{
    chomp; 
    my ($_ID,$CAT_ID,$TITLE,$SHORT_DESC,$FULL_DESC,$META_TITLE,$META_K
+EYWORDS,$META_DESCRIPTION,$THUMB_IMAGE,$DETAIL_IMAGE,$LARGE_IMAGE,$LI
+ST_PRICE,$PRICE,$SALE_PRICE,$FLAT_RATE_SHIPPING,$IN_STOCK,$NUM_SOLD,$
+WEIGHT,$BOX_LENGTH,$BOX_WIDTH,$BOX_HEIGHT,$MAX_PER_BOX,$CHARGE_SHIPPI
+NG,$REALTIME_OVERRIDE,$CHARGE_TAX,$IS_NEW,$IS_FEATURED,$SHIP_SEPERATL
+Y,$VIEWABLE,$ORDERABLE,$REWARDS_EARNABLE,$REWARDS_REDEEMABLE,$REQUIRE
+_ADDTOCART,$AVAIL_TO,$MANUFACTURER,$VENDOR,$SKU) 
    = split (/\t/, $_, 37);

    print newfile $SKU . "\n";

}

close myfile;
close newfile;

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In reply to Re^2: Error Undefined subroutine &main::OPEN called at C:\Perl\sku_corr2.pl line 8. by WBWARD
in thread Error Undefined subroutine &main::OPEN called at C:\Perl\sku_corr2.pl line 8. by WBWARD

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