adding some data at the end of a line

[mummaneni]

Hi Everybody,

I want to add some data at the end of a line in a file..
For example:
contents of my /etc/group file are:

nobody::60001:
noaccess::60002:
nogroup::65534:
nms::2500:nms1,nms2,nms3,nms4
ctxadm::55000:
sybase::202:

Here I want to add nms5 in nms group, means at the end of line.
How can I achieve this.
Please help me.

Thanks Inadvance,
Mummaneni.

[Franklin52]

With awk:

awk '/nms:/{print $0",nms5";next}{print}' /etc/group > temp_file
mv temp_file /etc/group

Regards