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Full Discussion: Append users if GID exists
Top Forums Shell Programming and Scripting Append users if GID exists Post 302706519 by MaindotC on Thursday 27th of September 2012 01:02:49 AM
Old 09-27-2012
Append users if GID exists
I have thousands of users assigned various roles. The role header defines the GID that they should have. If I can get all the GID information into /etc/group format I can upload the output file and easily assign all users into the desired GID. Right now I can get an output file like this:
Code:
oracle:x:4579:user1
oracle:x:4579:user2
sybase:x:9475:user1
sybase:x:9475:user2
oracle:x:4579:user3
oracle:x:4579:user4
sybase:x:9475:user5

There's nothing wrong with uploading the file like this, but it's pretty big. The way I produce this is via the following function:
Code:
for i in $(cat $tmp_gid_file)
do
TMP_GID=`grep -w $i master_group_list | sed 's/:/:x:/'`
echo $TMP_GID:$USER_ID >> gid_file

tmp_gid_file has a list of GID's line by line. I have to search the GID in a master file instead of getent group (it's a long story) and it returns <group_name>:<GID> so that's why I have to replace the colon with a :x:

I'd like to produce a GID file that has only 1 GID entry per line and does not duplicate. I would like it to look like this:
Code:
oracle:x:4579:user1,user2,user3,user4
sybase:x:9475:user1,user2,user5

I started with an if statement but I have a problem appending the user's ID to the end of the line where the GID is found:
Code:
GID_EXISTS=`grep -iw $i gid_file`
if [ ! -z $GID_EXISTS ] 
then
   sed '/$i/s/$/:$USER_ID/' gid_file  ##This seems to print the line, not append 
                                      ##the user's ID to the line where the GID is found
else
...

I'm using GNU/Linux (that's what I get from uname -a...not sure if it's rhel or suse or what) and my shell is bash.
Last edited by vbe; 09-27-2012 at 05:27 AM..
 

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LEARN ABOUT DEBIAN

sss_groupadd

SSS_GROUPADD(8) 						 SSSD Manual pages						   SSS_GROUPADD(8)

NAME

       sss_groupadd - create a new group

SYNOPSIS

       sss_groupadd [options] GROUP

DESCRIPTION

       sss_groupadd creates a new group. These groups are compatible with POSIX groups, with the additional feature that they can contain other
       groups as members.

OPTIONS

       -g,--gid GID
	   Set the GID of the group to the value of GID. If not given, it is chosen automatically.

       -h,--help
	   Display help message and exit.

THE LOCAL DOMAIN

       In order to function correctly, a domain with "id_provider=local" must be created and the SSSD must be running.

       The administrator might want to use the SSSD local users instead of traditional UNIX users in cases where the group nesting (see
       sss_groupadd(8)) is needed. The local users are also useful for testing and development of the SSSD without having to deploy a full remote
       server. The sss_user* and sss_group* tools use a local LDB storage to store users and groups.

SEE ALSO

       sss_groupdel(8), sss_groupmod(8), sss_groupshow(8), sss_useradd(8), sss_userdel(8), sss_usermod(8).

AUTHORS

       The SSSD upstream - http://fedorahosted.org/sssd

SSSD
								    03/04/2013							   SSS_GROUPADD(8)
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