How to add a single user to more than one group ?
 

Hello, I am new to Linux. Can anyone tell me how to add a single user to more than one group ?

See man usermod for details.

Hi,

With the usermod command you can, among other things, add groups to a user:

usermod -G group1,group2 foobar, this would add group1 and group2 to user foobar.

Look at the usermod manpage for all other options.

Hope this helps.