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PONeed perl inplace editing of files not on command line
 

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    <p>I have a program that has a number of filenames configured internally. The program edits a bunch of configuration files associated with a database account, then changes the database password for the database account. The list of config files is associated with the name of the database account via an internal list. When I process these files, I have the following loop in my program:</p> <pre><code>BEGIN { $^I = '.oldPW'; } # Enable in-place editing ... foreach (@{$Services{$request}{'files'}}) { my $filename = $Services{$request}{'configDir'} . '/' . $_; print "Processing ${filename}\n"; open CONFIGFILE, '+&lt;', $filename or warn $!; while (&lt;CONFIGFILE&gt;) { s/$oldPass/$newPass/; print; } close CONFIGFILE; } </code></pre> <p>The problem is, this writes the modified output to STDOUT, not CONFIGFILE. How do I get this to actually edit inplace? Move the $^I inside the loop? print CONFIGFILE? I'm stumped.</p> <blockquote> <p></p> </blockquote> <p><strong>Update:</strong> I found what I was looking for on <a href="http://www.perlmonks.org/?node_id=106461">perlmonks</a>. You can use a local ARGV inside the loop to do inplace editing in the normal perl way. The above loop now looks like:</p> <pre><code>foreach (@{$Services{$request}{'files'}}) { my $filename = $Services{$request}{'configDir'} . '/' . $_; print "Processing ${filename}\n"; { local @ARGV = ( $filename); while (&lt;&gt;) { s/$oldPass/$newPass/; print; } } } </code></pre> <p>If it weren't for tacking the configDir on the beginning, I could just toss the whole list into the local @ARGV, but this is efficient enough.</p> <p>Thanks for the helpful suggestions on Tie::File, I'd probably go that way if doing this over. The config files I'm editing are never more than a few Kbytes in length, so a Tie wouldn't use too much memory.</p>
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