Provided by:
passwd_4.1.4.2-1ubuntu3_i386 
usermod -
usermod [-c comment] [-d home_dir [-m]]
[-e expire_date] [-f inactive_time]
[-g initial_group] [-G group [,...]]
[-l login_name] [-p passwd]
[-s shell] [-u uid [-o]] [-L|-U] login
usermod
usermod
-c comment
chfn(1)
-d home_dir
-m
()
-e expire_date
YYYY-MM-DD
-f inactive_days
0
-1 -1
-g initial_group
ID
1
-G group,[...]
(supplementary groups)
-g
-l login_name
login login_name
-p passwd
crypt(3)
-s shell
-u uid ID -o
0 999
ID
-L
'!'
-p -U
-U
'!'
-p -L
usermod
ID
crontab at NIS NIS
/etc/passwd -
/etc/shadow -
/etc/group -
chfn(1),
chsh(1), passwd(1), crypt(3), groupadd(8), groupdel(8), groupmod(8),
useradd(8), userdel(8)
USERMOD(8)