I changed my /usr permission to read only . After that not able to perform any command.
Not event able to execute , "clear" or any other operation , nor able to login as sudo . sudo command is not found.
/usr/ now has following permission :
dr--------
What can I do to get following permission back :
drwxr-xr-x
I am unable to perform any operation like :
vi
sudo
chmod
clear
/
drive and try changing the permissions back.