Login as TeamsServer system user How can I login as the _teamsserver user? I have sudoed and set the passwd for teamsserver, but it does not take it when I use the login command. I need to see the output of some scripts as they are run by teamsserver, and verify that teamsserver has the correct permissions and utilities available.
To just look at log files etc. I usually use either

sudo less /path/to/log/file


or (in case I need root access longer) run sudo -s to get a root shell.

To run processes as another user you can use 

sudo -H -u _teamserver cmd-to-run


And finally, to simulate a login there is

sudo -H -u _teamserver -i