File permissions
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chmod
You can change file permissions with:
user $ chmod [r][g][u] [file]
[r] = number for root permissions, [g] = number for group permissions and [u] = number for user permissions.
7 = 4+2+1 (read/write/execute) 6 = 4+2 (read/write) 5 = 4+1 (read/execute) 4 = 4 (read) 3 = 2+1 (write/execute) 2 = 2 (write) 1 = 1 (execute)
chown
You can change owner and group of file with:
root # chown [user]:[group] [file]
You can change owner of folder and files inside recursively with:
root # chown -R [user]:[group] [folder]
gpasswd
You can add user to group with:
root # gpasswd -a [user] [group]
You can remove user from group with:
root # gpasswd -d [user] [group]
useradd
You can add new user with:
root # useradd -g users -G wheel,audio,portage -m [user] root # passwd [user]
You can delete user with:
root # userdel [user]
groupadd
You can add new group with:
root # groupadd [group]
You can delete group with:
root # groupdel [group]