1. Change the permission group to which the file belongs
chgrp -R (for recursively changing directory files) userName dname/fname
2. Change the file owner
chown -R owning user: owning user group fname/dname
3. Change file permissions
Permissions: read 4 write 2 execute 1
chmod XXX fname/dname
1. User and user group creation:
User creation: useradd -g user group username
Delete: userdel -r username will delete the user home directory together
Modify: usermod -g Modify the permission group to which the user belongs
User group modification
groupmod –g 10000 -n group3 group2
This command changes the identification number of group group2 to 10000 and the group name to group3
2. View the group to which the user belongs
groups username
3. View user group information
vim /etc/group
cat /etc/group | grep test View test user group information