Assigning Rights to directories in UNIX

I need to give a particular user access to delete files in a certain directory, one owned by root - how can I do this?

I am familiar with NetWare security where you can create a group that has certain access to a directory/directories and you then put users in the group(s) you want.  A user can belong to MANY groups.  If you can explain the UNIX security in relationship to how it works in NetWare feel free!
lphillips120898Asked:
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n0thingCommented:
1- Create a new group in /etc/group
2- Change the directory permission to 775
3- Change the group ownership of that directory
to the newgroup by using the chgrp command.
4- Create the new user and assign him to the
group you just created in /etc/group.

Now any users belonging to that group could remove files from that directory.

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lphillips120898Author Commented:
How many groups can a user belong to?
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n0thingCommented:
Depending on the OS. He could belong to as much as 15. You'll just need to separate the group ID by
a comma in the /etc/passwd file.
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