Urgent help needed to write a script

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http://www.unix.com – User have given me about 450 commands, i just wanted to know the full path for those commands and the output should be redirected to a separate file. Instead of running "which" command each time to find the path for all those commands, i need to do this in a simple way by a script. which checkeq which checknr which chgrp which chkey which chmod which chown which chrtbl which ckdate which ckgid (HowTos)