How to conditionally substitute in files?

[email protected] ("Siegfried Heintze (Aditi)") Thu, 12 Jun 2008 12:17:23 -0700

Newsgroups	perl.beginners
Message-ID	<EB070C90E3B48C4F97C7AC252BACE9E72326A6B42E@NA-EXMSG-C125.redmond.corp.microsoft.com>

This works:

perl -i.bak -ple "s/class/xybpublicabc/g" Migration.cs

However, when there are no matches, it still creates a new .bak file.

How can we not change the date time on a file if there are no substitutions make?

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