Command Line Cmds for User Management

mac57 · 2006-01-13 19:24:11

Is there a command line command that will simply display the user groups that a user belongs to?

Is there a command line command that will simply add a supplied group name to the list of groups a user belongs to?

Finally, is there a command line command that will list all the defined groups in the system?

Thanks!

codergeek42 · 2006-01-13 19:34:21

mac57 wrote:

Is there a command line command that will simply display the user groups that a user belongs to?

# groups <user>

Is there a command line command that will simply add a supplied group name to the list of groups a user belongs to?

# gpasswd -a <user> <group>

Finally, is there a command line command that will list all the defined groups in the system?

Take a look at the first field of each line /etc/group file. There's probably a simpler way to do it, but:

# awk -F ":" '{print $1;}' </etc/group | sort

Hope that helps!

mac57 · 2006-01-13 19:38:29

codergeek42, thanks! One question. If I do a man page lookup on gpasswd, it tells me that this command changes the password for a group. Further, there is no "-a" option listed. Did you REALLY mean "gpasswd"?

Snowman · 2006-01-13 19:38:37

1. $ groups
2. $ gpasswd -a user group
3. Don't know about the specific command but
$ cat /etc/group will display all the available groups. Don't try to manage groups by editing /etc/group. Instead, use the gpasswd utility.

Moo-Crumpus · 2006-01-13 19:39:23

he meant what he said

Snowman · 2006-01-13 19:42:20

codergeek42 beat me!
It's really gpasswd and the -a option is listed.
$ man gpasswd
Perhaps you were looking at another man page or missed it.

mac57 · 2006-01-13 19:50:32

OK, you caught me. I am reading this on a SuSE 9.3 machine right now, and when I do "man gpasswd" I get a manpage for a command that changes the password for a group, and only has a "-r" option. I'll try this out again when I boot my Arch system and hopefully, all will be well. Thanks for the help, and thanks especially for that awk sequence. Works like a champ, but I would have never been able to think it up. Never spent much time awk.

codergeek42 · 2006-01-13 20:25:14

phrakture · 2006-01-13 20:27:55

codergeek42 wrote:

There's probably a simpler way to do it, but:
# awk -F ":" '{print $1;}' </etc/group | sort
Hope that helps!

Little bit simpler:

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

codergeek42 · 2006-01-13 21:46:01

I knew there had to be a nicer way of doing that! Thanks, phrakture.

(By the way, `cat foo | cmd` in Bash can usually be replaced by `cmd < foo` just FYI )

loserMcloser · 2006-01-17 14:29:06

mac57 wrote:

Is there a command line command that will simply add a supplied group name to the list of groups a user belongs to?

usermod -a -G <group> <user>

mac57 · 2006-01-20 03:15:05

Excellent, thanks. This seems more intuitively obvious than the gpasswd command. Thanks again.

Arch Linux

#1 2006-01-13 19:24:11

Command Line Cmds for User Management

#2 2006-01-13 19:34:21

Re: Command Line Cmds for User Management

#3 2006-01-13 19:38:29

Re: Command Line Cmds for User Management

#4 2006-01-13 19:38:37

Re: Command Line Cmds for User Management

#5 2006-01-13 19:39:23

Re: Command Line Cmds for User Management

#6 2006-01-13 19:42:20

Re: Command Line Cmds for User Management

#7 2006-01-13 19:50:32

Re: Command Line Cmds for User Management

#8 2006-01-13 20:25:14

Re: Command Line Cmds for User Management

#9 2006-01-13 20:27:55

Re: Command Line Cmds for User Management

#10 2006-01-13 21:46:01

Re: Command Line Cmds for User Management

#11 2006-01-17 14:29:06

Re: Command Line Cmds for User Management

#12 2006-01-20 03:15:05

Re: Command Line Cmds for User Management

Board footer