pushd saves the current working directory in memory.
popd returns to the path at the top of the directory stack.
Example
[sputnik@localhost html]$ pushd . # push current directory to memory
/var/www/html /var/www/html
[sputnik@localhost etc]$ cd /var/games/ # change directory
[mshnaydman@localhost games]$ popd # returns from directory
/var/www/html
[sputnik@imagick-test html]$
For more information, read the Wiki Page
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