Use this script to rename a user in RHEL / CentOS / Ubuntu etc

user-rename.sh

#!/bin/bash
# Author : Jobin Joseph
clear
echo "Script for renaming a User
Use at your own risk"
echo -n "Enter the current username: "
read joldname
echo -n "Enter the new username: "
read jnewname

echo "########################
The user * $joldname * will be renamed to * $jnewname *
Press ctrl+c to cancel, The commands will be executed in 10 seconds
########################"
sleep 10
# rename the user
usermod -l $jnewname $joldname
#rename group
groupmod -n $jnewname $joldname
#move home
usermod -m -d /home/$jnewname $jnewname

if [ $? -eq 0 ] ; then
echo "########################
The account has been renamed, Please update the sudeors file if the user has sudo access
########################"
id $jnewname
else
echo "********* Something went Wrong !!! Please check the above error message *********"
fi
exit 0