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Tip #201   Store a directory name to come back to

Put the following alias in your profile to store a directory name to use later on:
alias sd='set \!:1=$cwd'


Example usage:
$ sd mydir
...
$ cd mydir


This method works for csh but not bash. For bash try the following function in your profile:
sd(){ export $1=$PWD; }


Then:
$ sd abc
...
$ cd $abc