OS X Finder->File->Duplicate (⌘ D) Name Suffix

Note: This trick no longer works! As of El Capitan, “System Integrity Protection” prevents any file in /System from being modified.

Finder’s default name suffix for duplicating files is ( ” copy”, ” copy 2″, ” copy 3″, …). If you do production work where you often make many duplicates of a file, you’ll likely have found that the default suffix is not appropriate. Fortunately this suffix can be changed by editing the Finder.app Localizable.strings resource. The path to the english version of this file is

/System/Library/CoreServices/Finder.app/Contents/Resources/English.lproj/Localizable.strings

By changing

<key>N4_V1</key>
<string>^1 copy</string>
<key>N4_V2</key>
<string>^1 copy ^0</string>

to

<key>N4_V1</key>
<string>^1_1</string>
<key>N4_V2</key>
<string>^1_^0</string>

your new files will have the suffix (“_1”, “_2”, “_3”, …).

TechNote #40