Here's another option:

use strict;
use warnings;
use File::Slurp qw/ read_file write_file /;

$ARGV[0] or die "\nUsage: $0 <File>\n\n";

my $userlistContents = read_file $ARGV[0];

for ( grep /\S/, <DATA> ) {
    my ( $before, $after ) = split;
    $userlistContents =~ s/\b$before\b/$after/g;
}

write_file "changed_$ARGV[0]", $userlistContents;

__DATA__
JOE    JOHN
FRED    FREDERICK
SAM    SAMANTHA

[download]

Using File::Slurp is a nice way to get the file's contents into a scalar upon which global substitutions can be performed. The before and after names in the __DATA__ area are tab separated. Note that the changed file contents are written to the file named "changed_$ARGV[0]".

Hope this helps!

In reply to Re: How to replace strings in a file from a list? by Kenosis
in thread How to replace strings in a file from a list? by zBernie

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.