Legend:
u – users
g – groups
o – others
a – all
To add a write permissions for the user (+ because we want to add them):
chmod u+w file |
To remove a read/write permissions for the group (- because we want to remove them):
chmod g-rw file |
Specifying multiple permissions per once:
chmod u=rwx, go=r file |
Specifying permissions for all groups:
chmod a+r file |
Setting permissions recursively:
chmod -R o-rwx some/directory |