Ubuntu uses the 5th field (comment field) in the /etc/password for full name
and other info.
See passwd(5)
# man -S5 passwd
# who am i
dennis pts/0 2013-02-03 06:19 (:0)
$ cat /etc/passwd | grep dennis
dennis:x:1000:1000:John Lennon,,,:/home/dennis:/bin/bash
# cat /etc/passwd | grep dennis | cut -d: -f5
John Lennon,,,
To change your full name:
$ sudo chfn -f "Paul McCartney" dennis
$ cat /etc/passwd | grep dennis
dennis:x:1000:1000:Paul McCartney,,,:/home/dennis:/bin/bash
Ubuntu also uses the 5th field for other info:
$ chfn
Password:
Changing the user information for dennis
Enter the new value, or press ENTER for the default
Full Name: Paul McCartney
Room Number []: 10
Work Phone []: X1234
Home Phone []: 555-1212
$ cat /etc/passwd | grep dennis
dennis:x:1000:1000:Paul McCartney,10,X1234,555-1212:/home/dennis:/bin/bash
$ finger dennis
Login: dennis
Name: Paul McCartney
Directory: /home/dennis
Shell: /bin/bash
On since Sun Feb 3 06:19 (EST) on tty7 from :0
46 minutes 24 seconds idle
On since Sun Feb 3 06:19 (EST) on pts/0 from :0 (messages off)
