how to remove a user from secondary group using command line
 

Sir ,

I have a user 'jai' and his primary group is 'jai'. This user is also a member of group 'student'. I want to remove this user from student group. Can i do this from command line.

or just edit the file /etc/group and remove jai from the list of users in the student group.

Thanks colucix...It worked wonderfully...