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Get the gid from a group name

 
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# 1  
Old 04-16-2010
Question Get the gid from a group name
Hi there,

One can easily retrieve the uid from a username :
Code:
id -u $username

But how can we easily retrieve the gid from a group name?
I mean is there a command without using sed?
Code:
sed -nr "s/^$groupname:x:([0-9]+):.*/\1/p" /etc/group

Thanks for your help
Santiago
# 2  
Old 04-16-2010
Does your id version support
Code:
id -G -n

# 3  
Old 04-16-2010
Not that we know of..
But there is nothing to stop you writing one (with no sed in it...)
I made an alias in my .kshrc:
Code:
.
.
GROUPID()
{
if [ $# -ne 0 ]
  then
    GRPID=$1
    grep "^$GRPID" /etc/group|cut -d: -f3
else
  echo USAGE="Usage: grp_id <group name> "
fi
}
alias grp_id=GROUPID
.

You could write a shell script you put in /usr/local/bin... with more tests than above...
# 4  
Old 04-16-2010
I'm confused. On solaris 5.9:
Code:
> id -G -n  mwillow
devl restart_devl
>which id
/usr/xpg4/bin/id

produces group name[s] for a given username?

What am I missing here? Other than maybe something to select the first/second/third group name when the list has multiple names. You don't need grep or awk on /etc/groups.

This:
id
says those semantics are the POSIX standard.
# 5  
Old 04-16-2010
I understood "I want GID of a given group name, not from a user Id"...
# 6  
Old 04-16-2010
The OP's question was, how to get a GID for a given groupname. The easiest solution I can think of is this:
Code:
$ getent group sys | cut -d: -f3
3

It also works with LDAP, NIS, etc.
# 7  
Old 04-16-2010
but not native on HP or AIX...
 
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