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I'm trying to use external cd (/usr/bin/cd) to jump to parent directory /usr/bin/cd .. but it doesn't work (no error message, current directory remains as was). I know this is a builtin bash command and this whole operation is pointless but it's part of school assignment, any ideas how to achieve it?

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I found the answer myself. Proper usage is:

. /usr/bin/cd ..
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    that only works if /usr/bin/cd is implemented as a shell script. It doesn't have to be, though that would be a trivial implementation. – ilkkachu Mar 30 at 20:49

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