TuxTraining

Use the usermod command to change user name under Linux. it modifies the system account files to reflect the changes that are specified on the command line.

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1.) Firstly, lock the account to prevent the user from using the login until the change has been made:

# usermod -L <username>

2.) Change the password expiration date to 0 to ensure the user changes the password during the next login:

# chage -d 0 <username>

3.) To unlock the account after the change do the following:

# usermod -U <username>