[CVALE] musical groups

[Dennis Baker]

usermod + parsing the group file plus your favorite scripting language + a
cron job every 5 minutes?

grep admin /etc/group
  parse the line pulling all users out
usermod -name username dialout

the part that's tricky is removing people from groups.  you can certainly
use usermod to remove them from the groups but if you remove smeone from
admin are they always removed from dialout or only when they were added to
dialout because they were in admin?  You would have to keep that info
separate.

It might just be easier to write a script that adds/ removes them.

grantadmin.sh
#!/bin/bash
usermod --name $1 -a admin,dialout

unfortunately I don't know an easy way to drop someone from a group with
usermod.  The only thing I could figure is grab the groups they are in, drop
all groups and add the groups back in one at a time eliminating the admin
and dialout groups.

The only way I've figured out to get a list of groups easily is either:
grep username /etc/group
then parse the result

or

sudo -u username groups

the second result is cleaner but obviously requires sudo and privs.

I'm not very good with shell scripting and generally lean on php or python
so I'm not even going to take a stab at a script to parse those lines.  The
first you could probably use sed and xargs.  The second is maybe easier.

Sorry... more a braindump than much help.



On Jan 23, 2008 7:22 PM, Patrick Bennett <stnick at bennettbungalow.com> wrote:

> Does anyone know if it is possible, and if so how to do so properly
> either with the command line or editing the /etc/group file, to add
> group A to group B such that all users of group A at any given moment
> are also users of group B?
>
> For example,  joe, tina, and admin belong to the group called
> "administrators", while jane and sam are members of "dialout".  I want
> jan and sam to remain members of "dialout", while adding all members of
> "administrators" to also be members of "dialout".  Furthermore, six
> months from now when diego becomes a new "adminstrator" I want him to
> automatically become a member of "dialout", and he will be replacing
> joe, so when I remove joe from "adminsitrators" I want him to be
> automatically removed from "dialout".
>
> Thus, I want the group "administrators" to be a member of the group
> "dialout".  Is this possible?  (I'm not interested in tricky gui tools
> to do this for me.)
>
>    -Patrick
>
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-- 
Dennis Da-Ogre http://ogrehut.com
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