Change user/group file ownership (use -R switch to apply changes recursively):
chown user:group <file or directory>
Put a user in the administrator’s group (which enables login + sudo privileged access):
adduser <user> adm
Change file permissions (use -R switch to apply changes recursively):
chmod <permission> <file or directory>
Permissions:
0 – None
1 – Execute
2 – Write
4 – Execute
Permissions are given for user:group:other_users:
Example:
644 – Means: user 2+4 (rw), group: 4(r), other users: 4 (r)
