Where do I find the "cd" command? [closed]

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I need to know to know the full path of the command "cd" in ubuntu 10.04. Can anyone please help me find it. For example the full path of the command "dir" is "File System/bin/dir".

-Thanks in advance

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cd is one of the builtin commands of bash (or similar shells).

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/usr/bin/which screws up on shell builtins; type is a better alternative:

$ type cd
cd is a shell builtin