sudo su - temporarily become the superuser
chmod - modify file access rights
chown - change file ownership
chgrp - change a file's group owner
cat /etc/group |cut -d: -f1 // find all the groups available on your system
find /home -group user // find user named user
find /etc -group root // find group root
-rwxrw-r--rwx(Owner) - The owner has read/write and execute permissions.rw-(Group) - The group has read and write permissions.r--(Everyone else) - Everyone else has read permissions.
Running chmod -R 777 / as root will break your system.
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