There is no /etc/default/su file by default, but if you create one and put ALWAYS_SET_PATH yes
in it, then su *does* change the PATH variable, and this avoids the warning message from login. ii util-linux 2.33.1-0.1 amd64 miscellaneous system utilities unicorn:~$ cat /etc/default/su ALWAYS_SET_PATH yes unicorn:~$ echo "$PATH" /home/greg/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/sbin:/usr/sbin unicorn:~$ su Password: root@unicorn:/home/greg# echo "$PATH" /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin root@unicorn:/home/greg#
