Granting a group rights to access a particular directory?

I would like to know how to add a user to a group. And then, grant that group access or rights (rwx) to a particular directory.

My problem is that I have many different remote users who need to use ftp to add and remove files from many different directories.  These directories are websites or they hold the files that make up the website. I don't want the users to be able to access each others directories.  I would like to know how to create the user, set\restrict the path to a particular directory for that user.  Create a group that has rwx previlages to that directory.  Add the user to that group.  In some instances I have four or five users who need access to the directory.

The o/s is Solaris v5.6. The web server is Apache.  I'm familar with the useradd, groupadd, chmod, commands, the startup files /etc/profile, /export/home/username/.profile.  I've read about the umask, setuid, and setgid commands.

I'm an old Netware hand v2 through 6, but I'm really struggling on the Unix platform with what is such a simple task in Netware.
mobotAsked:
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TintinCommented:
Let's say you have a group called 'webadm' and users default group is 'other'.

You add all the users you want to add/remove files in the various directories to the webadm group using the groupadd command (or just vi /etc/group)

Then on the appropriate directories, you

chgrp webadm dirname
chmod g+wxs dirname

The set gid bit (s) ensures that any files created under the directory will have the webadm group.
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gheistCommented:
and leave o+r for all files and o+rx on directories, so webserver can still access them.
adjust user umasks accordingly so they do not remove public and group access to files
umask is just like file permissions, they denote bits which are not set on fresh files
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gheistCommented:
default umask usally is 022
change it to 002 so group writes are allowed to new files
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stefan73Commented:
Hi mobot,
Check ACLs (access control lists). I'm not sure if Solaris 5.6 supports them (I have 2.8 here).

Do "apropos acl".

Check the examples in
http://www.cs.indiana.edu/Facilities/software/ACL.html
http://snap.nlc.dcccd.edu/reference/sysadmin/julian/ch18/413-416.html

Cheers,
Stefan
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mobotAuthor Commented:
many thanks to all your help is much appreciated.
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