Hello,

I would like to setup a user wich creates files by default with chown=myuser:specialgrp and chmod=775.

Normally it uses it's deault group.

How do i setup all this? To be quite honest i know about umask i just don't know how to set it up.

Thank you.

umask us used to "switch off" bits on file creation.

e.g. - you don't want any world rights ==> umask 007


i recommend "man creat" as a starter.

usermod -g groupname
To set the users initial groups which will set the group when he creates files.

Put
umask 002
in their ~/.bash_profile
But, like AltF4 said, I would make the umask 007

Edit the fourth field of the /etc/passwd file. This is the GID entry for the user. Change it to the GID of the new default group. Your can look up the GID number of the group from the /etc/group file.

For example (as root),
1) add a user edward.
useradd edward
passwd edward[enter]
edspassward[/b][enter]

2) add a group edgroup.
groupadd edgroup

3) examine record for user edward
grep edward /etc/passwd
edward:x:502:502::/home/edward:/bin/bash

4) examine record for group edgroup
grep edgroup /etc/group
edgroup:x:503

5) edit gid field for user edward in /etc/passwd. (i.e. change second 502 to 503)
sed '/^edward:/s/:502:502:/:502:503:/' /etc/passwd >/etc/passwd.tmp
mv -f /etc/passwd.tmp /etc/passwd

You could use an editor like vi to edit the /etc/passwd file if you prefer.

Now log in as user 'edward' and touch a testfile.
touch testfile
ls -l testfile

Notice that the group field of the listing says edgroup.

---

ps
The solution given above is better. While I was testing my answer on another computer he submitted his answer. (how do I delete a message I wrote? I tried 'Reset Message' but it didn't work)

Thanks alot guys. I was hoping there was a way to maintain a different default group in /etc/passwd from the default group used for wrinting fines. Guess that that s not possible.

Thank you.

You'll need to repeat the last response. I didn't understand what you mean by 'wringing'.

You can create a new group and make certain users members of that group. You can also make this group their default group with the 'usermod -g groupname' mentioned above. That should provide exactly what you were asking about in your original message.

However, what is usually done is leaving the default group alone, but making users members of a certain group. This is the linux version of ACL lists.