I have been using a shell script as part of my Xcode build process to increment the build number within the *plist* file, however it&#39;s making Xcode 4.2.1 crash frequently (with an error about the target not belonging to a project; I&#39;m guessing the changing of the *plist* file is confusing Xcode in some way).

The shell script did this so that the build number is only incremented by `agvtool` when a file is newer than the *plist* file (so just building didn&#39;t increment the value):

    if [ -n \&quot;`find ProjDir -newer ProjDir/Project-Info.plist`\&quot; ]; then agvtool -noscm next-version -all; else echo \&quot;Version not incremented\&quot;; fi

Is there a way to increment the build number (in the *plist* file, or anywhere else) that doesn&#39;t break Xcode?

**FINAL EDIT**:  I now do this kind of stuff using a python script which I have just made public on [github](https://github.com/trojanfoe/xcodedevtools).  It&#39;s not well documented but shouldn&#39;t be difficult to work out.  As a bonus this repo also contains a useful script to automatically bundle 3rd party library into an app bundle. 

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Better way of incrementing build number?