1. Login to the NIS Master
2. Determine whether user id is existed.
# ypcat passwd | grep <userid>
# id <userid>
3. Determine the group.
# ypcat group | grep <groupname>
4. Determine the location of the NIS group files.
# ps -ef | grep yp (The group files are with the passwd file)
5. Backup the group file.
# cp group <groupbackupname> e.g cp group group.xyz
6. vi group
7. Add user into group.
8. ypmake only group.
# cd /var/yp
9. ‘ypmake group’ or ‘make group’
10. Repeat id <userid>, to confirm whether the user has been successfully added into the group