How to list user in Linux box, add an user to a group!

steady_lfcfan · 11-25-2005, 08:42 AM

I have found for time but i still don' know how to list the user in my linux box, also how can I add an exist user to a group!

trevelluk · 11-25-2005, 09:26 AM

To list the users:

cat /etc/passwd | cut -d":" -f1

Hmm, not sure about how to add an existing user to a group though.

pingu · 11-25-2005, 09:38 AM

Depending on distro and desktop, you probably have several gui's to choose from.
Search the menu, or systems control-center (if any), or kde's controlcenter.

Or do it the manual way:
List users:
# cat /etc/passwd
Add user to a group: edit /etc/group Syntax is:
cdrom:x:22

eterh,charles

The user of course has to exist or you'll have problems...

Command-line tools:
useradd and groupadd

steady_lfcfan · 11-25-2005, 08:29 PM

Quote:

Originally posted by steady_lfcfan
I have found for time but i still don' know how to list the user in my linux box, also how can I add an exist user to a group!

thank you, but this print all user includes system user (samba,apache ...)

Pingu, I am running Radhat box and I have not X installed, is there other way?

jrdioko · 11-26-2005, 12:30 AM

See if this helps.

syg00 · 11-26-2005, 12:51 AM

Quote:

Originally posted by steady_lfcfan
... also how can I add an exist user to a group!

"usermod -G ..." ???
See the manpage.

fr4X · 01-16-2008, 08:12 AM

well I see many answered to the listing users,but not so clear answers to adding an existing user to a group (no offense); you can do this by using the "gpasswd -a user group" command.

I know my answer is only a few years late but for googling people it might be nice

B-Con · 01-23-2008, 02:46 AM

As long as the thread got drug up...

Quote:

Originally Posted by syg00

"usermod -G ..." ???
See the manpage.

That's dangerous, since it will REMOVE the user from all current groups and put them ONLY in the specified groups.

Quote:

Originally Posted by manpage

-G, --groups GROUP1[,GROUP2,...[,GROUPN]]]
A list of supplementary groups which the user is also a member of.
Each group is separated from the next by a comma, with no
intervening whitespace. The groups are subject to the same
restrictions as the group given with the -g option. If the user is
currently a member of a group which is not listed, the user will be
removed from the group. This behaviour can be changed via the -a
option, which appends the user to the current supplementary group
list.

Be sure to do -aG, not just -G.

bdeank · 07-26-2009, 12:54 PM

For those following along at home, listing groups can be accomplished in the same way as users:

Code:

cat /etc/group | cut -d":" -f1