What to do to add a secondary user group? - Linux / Unix Administration

[qazmlp]

---------------------------------------------------
Format of /etc/group:
<Group name>:<Encrypted Password>:<Numerical Group ID>:<Individual
user names that are part of the group:'Group name'>

Format of /etc/passwd:
<userName> : <Encrypted Password> : <Numerical user ID> : <Numerical
Group ID> : <Comment Field> : <Initial Working Directory> : <Initial
shell>
---------------------------------------------------

As I understand, it is necessary to adapt only /etc/group to add a
secondary user group to a user.
For any reason, is it required to change /etc/passwd also? I assume
NO.
In my understanding, we mention only the Primary group Id in
/etc/passwd.

[Pascal Bourguignon]

[email]qazmlp1209rediffmail.com[/email] (qazmlp) writes:

> ---------------------------------------------------
> Format of /etc/group:
> <Group name>:<Encrypted Password>:<Numerical Group ID>:<Individual
> user names that are part of the group:'Group name'>
>
> Format of /etc/passwd:
> <userName> : <Encrypted Password> : <Numerical user ID> : <Numerical
> Group ID> : <Comment Field> : <Initial Working Directory> : <Initial
> shell>
> ---------------------------------------------------
>
> As I understand, it is necessary to adapt only /etc/group to add a
> secondary user group to a user.
> For any reason, is it required to change /etc/passwd also?
> I assume NO.
> In my understanding, we mention only the Primary group Id in
> /etc/passwd.

You understand and assume correctly.
The user have to login again though to get the new groups taken into account.

--
__Pascal Bourguignon__ [url]http://www.informatimago.com/[/url]

Our enemies are innovative and resourceful, and so are we. They never
stop thinking about new ways to harm our country and our people, and
neither do we.

[Jens.Toerring@physik.fu-berlin.de]

In comp.unix.programmer Pascal Bourguignon <spammouse-potato.com> wrote:

> [email]qazmlp1209rediffmail.com[/email] (qazmlp) writes:

>> ---------------------------------------------------
>> Format of /etc/group:
>> <Group name>:<Encrypted Password>:<Numerical Group ID>:<Individual
>> user names that are part of the group:'Group name'>
>>
>> Format of /etc/passwd:
>> <userName> : <Encrypted Password> : <Numerical user ID> : <Numerical
>> Group ID> : <Comment Field> : <Initial Working Directory> : <Initial
>> shell>
>> ---------------------------------------------------
>>
>> As I understand, it is necessary to adapt only /etc/group to add a
>> secondary user group to a user.
>> For any reason, is it required to change /etc/passwd also?
>> I assume NO.
>> In my understanding, we mention only the Primary group Id in
>> /etc/passwd.

> You understand and assume correctly.
> The user have to login again though to get the new groups taken into account.

And there can also be a gshadow file that has the same function as
/etc/shadow for /etc/passwd, which might also require tweaking...

Regards, Jens
--
\ Jens Thoms Toerring ___ [email]Jens.Toerringphysik.fu-berlin.de[/email]
\__________________________ [url]http://www.toerring.de[/url]