The newgrp command

[Vidol Loeung]

Thanks. It's kind of short. However, it seems clear from this link
(http://www.tldp.org/LDP/intro-linux/html/sect_03_04.html) that a user can
use newgrp command successfully only if the new group (s)he would like to
switch to is already a secondary group for the user.

Regards,
Vidol

----- Original Message ----- 
From: "Richard E Miles" <r.godzilla at comcast.net>
To: "For users of Fedora Core releases" <fedora-list at redhat.com>
Sent: Thursday, August 25, 2005 8:25 AM
Subject: Re: The newgrp command


> On Thu, 25 Aug 2005 08:24:05 +0700
> Vidol Loeung <fedora.kh at undp.org> wrote:
>
> > Thanks Richard. When I as a user used newgrp to switch myself to a new
> > group, I of course gave the password of that group, which was assigned
by
> > the gpasswd comamnd as you mentioned. I also agree that, this command is
> > rarely used and I think, it only makes sense when a user would like
> > files/directories (s)he creates to belong to a particular group. Having
the
> > user as a member in each group is fine.
> >
> > My question was out of curiosity as I was trying to experiment the
newgrp
> > command and found that it did not seem to work the way it should as its
> > manual and documentations stated that the command is used to switch a
user
> > to a new group and requires the group password.
> >
> > Let me give a scenario here:
> > - I logged in as user 'joe'.
> > - Then, I typed this command ('joe' is not a member of group 'users'):
> >   $ newgrp users
> >   Password:
> >   newgrp: Permission denied
> >
> > I've wondering what the group passwd command is used for and found that
the
> > newgrp command is the one that needs the group passwd. Now, when I tried
it
> > as above it did not work.
> >
> > Would someone kindly clarify a bit more on the use of the newgrp
command?
> >
> > Regards,
> > Vidol
> >
> > ----- Original Message ----- 
> > From: <rengland at europa.com>
> > To: "For users of Fedora Core releases" <fedora-list at redhat.com>
> > Sent: Wednesday, August 24, 2005 3:07 AM
> > Subject: Re: The newgrp command
> >
> >
> > > > Thank you Ben and Richard for yoru replies.
> > > >
> > > > Well, Ben you are right, root can switch to any group without having
to
> > > > give
> > > > a password. I also discovered the same as what Richard said.
However, in
> > > > case an ordinary user is not a member of a particular group and
she/he
> > > > tries
> > > > to use the newgrp command to switch to that group with correct
password,
> > > > it
> > > > always gave the error message: Permission denied.
> > > >
> > > > Read a lot of docs on it but still could not help.
> > > >
> > > > Regards,
> > > > Vidol
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Richard England" <rengland at europa.com>
> > > > To: "For users of Fedora Core releases" <fedora-list at redhat.com>
> > > > Sent: Tuesday, August 23, 2005 1:06 PM
> > > > Subject: Re: The newgrp command
> > > >
> > > >
> > > >>
> > > >> Ben Stringer wrote:
> > > >>
> > > >> >On Tue, 2005-08-23 at 12:17 +0700, Vidol Loeung wrote:
> > > >> >
> > > >> >
> > > >> >>Dear All:
> > > >> >>
> > > >> >>The newgrp command seems simple to use. However, I could not use
it
> > or
> > > >> I
> > > > did
> > > >> >>not know how to use it.
> > > >> >>
> > > >> >>Could someone please explain me what teh problem is? I was logged
in
> > > >> as
> > > > an
> > > >> >>ordinary user and type the command:
> > > >> >>$ newgrp users
> > > >> >>It asked me for the group password and I entered it but it said:
> > > > "Permission
> > > >> >>denied".
> > > >> >>
> > > >> >>
> > > >> >
> > > >> >Hi Vidol,
> > > >> >
> > > >> >You will need to be the root user to run this command.
> > > >> >
> > > >> >Try this:
> > > >> >
> > > >> >$ su -
> > > >> ># newgrp users
> > > >> >
> > > >> >Cheers, Ben
> > > >> >
> > > >> >
> > > >> >
> > > >> >>Regards,
> > > >> >>Vidol
> > > >> >>
> > > >> >>
> > > >> >>
> > > >> I don't believe that is strictly true.  If the userid is included
in
> > > >> several groups, all the user has to do is type in "newgrp
> > <newgrpname>".
> > > >> However, if the user is NOT member of the group, then they are
prompted
> > > >> for the group password.
> > > >>
> > > >> Use the command "id" to find out what your primary group currently
is,
> > > >> and the command "groups" to find out what groups your userid is
> > > >> currently a member of.
> > > >>
> > > >> --R
> > > >>
> > > >> --
> > > >> fedora-list mailing list
> > > >> fedora-list at redhat.com
> > > >> To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
> > > >
> > > > --
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> > > >
> > > >
> > >
> > >
> > > I'm no expert on this but what password were you entering for the
group?
> > > Do you know what, if any password was assigned to the group?  It may
or
> > > may not be the same as you login passwd.
> > >
> > > You can modify the group password using gpasswd  (see the man page).
I
> > > did not investigate to find out how the original (creation time)
password
> > > is set.
> > >
> > > I've only used a small number of groups  (3-4) on my personal machine
and
> > > I've added my userid to each so I've never had to use newgrp there.
At
> > > work I don't have permissions to modify anything at this level so I've
not
> > > worked with it.
> > >
>
> see man newgrp.
>
>
> -- 
> Richard Miles
> Federal Way WA. USA
> registered linux user 46097
>
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