Exactly as the question title. I have an existing user, and I basically want to clone it for a new user. Is there a particularly easy way to do this?
Think I make a group with that user's permissions, and then add that new user to that group?
On Linux (as on any POSIX system), permissions aren't tied to users. Each object (files, directories, and a few others) grants permissions to some users and some groups.
To make two users as similar as possible, make the new one a member of all the same groups as the old one. Of course, permissions that mention the user specifically (and not a group he belongs to) won't include the new one.
If you don't want to keep the old user, you can recycle the user number (UID). That way, the new user is in effect just a new name of the old one, and every privilege it had will be preserved.
If you want to make a user on the same system (not a migration from another system), use a combination of the
Keep in mind that you may not want the new user to have the same GID, just because you want him in the same groups.