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Normal Permissions¶

permissions assignments¶

chmod o+x file
chmod o-w file
chgrp group_name /directory
chmod 600 file

add users¶

useradd foo -s /bin/bash -d /home/foo
passwd foo
chgrp foo foo
chown foo foo
# alternative
chown foo:foo foo

add group¶

groupadd new_grupo
usermod -a -G new_grup foo

octal permissions¶

special permissions¶

chmod +t file     
chttr +i -V file
chmod g+s file
chmod 4755 file