Linux usermod command

Linux Command Reference

The Linux usermod command is used to modify user accounts.

usermod can be used to modify various settings of a user account.

Syntax

usermod [-LU][-c <备注>][-d <登入目录>][-e <有效期限>][-f <缓冲天数>][-g <群组>][-G <群组>][-l <帐号名称>][-s <shell>][-u <uid>][用户帐号]

Parameter Description：

• -c<comment> 　Modify the comment text for the user account.
• -d<login directory> 　Modify the directory used when the user logs in.
• -e<expiration date> 　Modify the account's expiration date.
• -f<buffer days> 　Modify how many days after the password expires the account is closed.
• -g<group> 　Modify the group to which the user belongs.
• -G<group> 　Modify the supplementary groups to which the user belongs.
• -l<account name> 　Modify the user account name.
• -L 　Lock the user password and make it invalid.
• -s<shell> 　Modify the shell used by the user after login.
• -u<uid> 　Modify the user ID.
• -U 　Unlock the password.

Examples

Change Login Directory

# usermod -d /home/hnlinux root

Change the user's UID

# usermod -u 777 root

Linux Command Reference