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