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Command (not a program), built in to the shell, that changes the current directory.

Read more: Wikipedia on cd .

Example usage

Assuming you have a directory called tmp in your present working directory you can enter that directory (tmp) like this

$ cd tmp

If you want to enter the directory /usr/bin you enter:

$ cd /usr/bin

If you want to go to your HOME directory you can do any of the following:

$ cd


$ cd ${HOME}


$ cd ~