Use of Linux usermod command

usermod [OPTIONS] LOGIN

-c, --comment
Add backup information -d, --home HOME_DIR
The user's new home directory -e, --expiredate EXPIRE_DATE
Set the account expiration date -f, --inactive INACTIVE
After INACTIVE days, set the password to invalid state -g, --gid GROUP
Force GROUP to be the new primary group -G, --groups GROUPS
New additional group list GROUPS
-a, --append GROUP
Add the user to the additional groups mentioned in -G above, without removing the user from other groups -h, --help
Display this help message and launch -l, --login LOGIN
new login name -L, --lock
Lock user account -m, --move-home
Move the contents of your home directory to a new location (only used with -d)
-o, --non-unique
Allow duplicate (non-unique) UIDs
-p, --password PASSWORD
Set the encrypted password (PASSWORD) as the new password -s, --shell SHELL
The new login shell for this user account
-u, --uid UID
New UID for the user account
-U, --unlock
Unlock user account -Z, --selinux-user SEUSER
New SELinux user mapping for user accounts

usermod -d /home/tom tom

usermod -u 888 tom

usermod -l jerry tom

usermod -L tom

usermod -U tom

usermod -G deng tom

usermod -s /bin/sh tom

usermod -g 1003 tom

usermod -e 2020-12-31 tom

usermod -f 3 tom