Re: Give diferents permision to several groups?
> I have a Folder name folder1 an 2 groups, group1 and group2.
> I want group1 to be able to change all the files inside folder1. But at
> the same time I want group2 to only read the files in folder1. I do not
> want to give any permission to any other users.
You cannot do this directly with the unix group system. I would do the
following: give the files in the directory folder1 the permissions 660,
and make them owned by group1. Then write a small C-program that is
setguid group1, and does the following:
* check if the person who runs it is a member of group2 (use getuid,
getgid, and getgroups, see the info page of libc)
* if not --> exit
else --> cat the requested file
so that users of group 2 could do something like
viewit file | less
If you are not into C-programming, an alternative would be to have a
cron-script running that copies the files from folder1 to a second
folder, and do a chgrp group2 and a chmod 640 on the files. Also make
sure that this second folder is not writeable for members of group2.
E.L. Meijer (firstname.lastname@example.org) | tel. office +31 40 2472189
Eindhoven Univ. of Technology | tel. lab. +31 40 2475032
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