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Check users in a Linux group

 
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# 1  
Old 10-02-2014
Check users in a Linux group
How do you check users in a linux group?
# 2  
Old 10-02-2014
Replace groupname with the name of your group.

Code:
grep -i color groupname /etc/group

# 3  
Old 10-02-2014
The command groups <user> will display the groups that user belongs to

id <user> will display groups id

The files /etc/passwd and /etc/group contain information concerning ids.
# 4  
Old 10-03-2014
Quote:
Originally Posted by colshine
Replace groupname with the name of your group.

Code:
grep -i color groupname /etc/group

What is the color argument for? This doesn't really make sense.

Code:
grep -i color cop /etc/group
grep: cop: No such file or directory

Quote:
Originally Posted by Aia
The command groups <user> will display the groups that user belongs to

id <user> will display groups id

The files /etc/passwd and /etc/group contain information concerning ids.
I'm looking for all users in a particular linux group. I'm not trying to find the groups that a particular user is in.
# 5  
Old 10-03-2014
On systems using traditional UNIX /etc/passwd and /etc/group to define the system's users and groups, the following should do what you want:
Code:
grp=Group_name
grep -E "[:,]$grp(,|$)" /etc/group | sed 's/:.*//'

If your system's grep utility doesn't understand the -E option, change grep -E to egrep.
=================================
Please ignore the above suggestion; it is backwards. It will give you the groups a user is in; not the users in a group.
Last edited by Don Cragun; 10-03-2014 at 08:18 AM.. Reason: Disclaimer
# 6  
Old 10-03-2014
That would not take into account the users whose primary or initial group is $grp, which is recorded in field 4 of /etc/passwd. Try
Code:
awk -vGRP="$grp"\
        'NR==FNR && $1==GRP     {printf "%s:%s", $1,$4; GRNO=$3; if ($4) DELIM=","}
         NR!=FNR && GRNO==""    {print "group not found!" > "/dev/stderr"; exit}
         NR!=FNR && $4==GRNO    {printf "%s%s", DELIM, $1; DELIM=","}
         END            {printf"\n"} 
        ' FS=: /etc/group /etc/passwd

# 7  
Old 10-03-2014
Quote:
Originally Posted by cokedude
What is the color argument for? This doesn't really make sense.

[CODE]grep -i color cop /etc/group
grep: cop: No such file or directory
It highlights the grep keyword in the output. You can remove the -i color if it is not working for you.
 
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