Change the UID in linux

Linux environment to change the user's UID Application example: 1, add newuser2 to the group staff # usermod-Gstaffnewuser22, modify newuser username newuser1 # usermod-lnewuser1newuser3, lock account newuser1... example of changing the UID Application in linux: 1. add newuser2 to the staff group # usermod-G staff newuser2. change newuser's username to newuser1 # usermod-l newuser1 newuser 3. lock account newuser1 # usermod-L newuser1 4 unlock newuser1 # usermod-U newuser1 function description: modify a user account. Syntax: usermod [-LU] [-c <>] [-d <>] [-e <>] [-f <>] [-g <>] [-G <>] [-l <>] [-s] [-u] [user account] supplementary instructions: usermod can be used to modify user account settings. Parameter:-c <> modify the remarks of the user account. -D logon directory <modify the directory when the user logs in. -E <> modify the validity period of the account. -F <> If the password expires, the account is closed for several days. -G <> modify the group to which the user belongs. -G <> modify the additional group to which the user belongs. -L <> modify the account name. -L lock the user password to make it invalid. -S: modify the shell used after user login. -U: modify the user ID. -U unlocks the password.