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This is like `cd -` but doesn't echo the new directory name, which is preferable (to me) for an alias, e.g.
alias cdo="cd $OLDPWD"
There are 2 alternatives - vote for the best!
as alternative to cd $OLDPWD
if you cd into a directory then cd into another directory somewhere else then you run the cd - command you will go to the previous directory you was in!! To go back to the other directory just run it again. So if you are working in 2 different directories then this is the perfect command for you.
If you can do better, submit your command here.
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