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Well, the title says it all:

Can I edit the Info.plist of an App so that is always starts hidden?

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Open the info.plist in textedit and check if the key "LSUIElement" exist. If not, then add the following piece of code.

<key>LSUIElement</key>
<true/>

If it does, then just change the key from <true/> to <false/>.

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I have changed the permission using chmod. Yet, I can't save changes because the file is locked. –  gentmatt Jan 8 '12 at 8:26
    
Save the file to your desktop, then copy it to the original location –  theAmateurProgrammer Jan 8 '12 at 8:52
    
I've tried this with the Twitter.app. Now I have to enter the password every time I open twitter.... –  gentmatt Jan 8 '12 at 9:02
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@theAmateurProgrammer Note the change I made so that your markup actually shows up plain. Stack Exchange tries to render html tags automatically, so it just ate your tags. Use a 4 space prefix to denote blocks (across multiple lines) of code, or backtick pairs to denote inline code lines. –  Jason Salaz Jan 8 '12 at 9:19
    
This does not make the app start hidden (i.e. like Cmd-H), but removed the Dock icon and menu bar. –  Daniel Beck Jan 26 '12 at 19:02
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