First commit - Change/replace Linux user account

replaceUser.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+# Created By	:	cybergavin
+# Created On	:	12-MAR-2020
+# Description	:	QAD script to change a user login name. 
+# USER-DEFINED  :   Replace 'user1' and 'user2' by the actual users to be swapped. user2 (new_user) must not be created before executing this script.
+#                   Will not execute if the old_user is logged in or owns a running process.
+#####################################################################################################################################################
+old_user=user1
+new_user=user2
+# Modify user's login name
+sudo usermod -l $new_user $old_user
+# Modify user's group name if same as user name
+[[ -n "`grep \"^${old_user}\" /etc/group`" ]] && sudo groupmod -n $new_user $old_user
+# Rename any file or directory named with the old user's login name
+for i in $(sudo find / -name "$old_user" -user $new_user 2>/dev/null)
+do
+        sudo mv $i `dirname $i`/${new_user}
+done
+# Change home directory for new user as "usermod" does not do it
+ohdir=`grep "^${new_user}" /etc/passwd |cut -d: -f6`
+if [ -n "`echo $ohdir | grep \"${old_user}\"`" ]; then
+        nhdir=`echo $ohdir | sed "s/${old_user}/${new_user}/g"`
+        sudo usermod -d $nhdir ${new_user}
+fi
+# Replace old user by new user in the sudoers file
+sudo sed -i "s/${old_user}/${new_user}/g" /etc/sudoers