File permissions
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Add user
root # useradd -g users -G wheel,portage,audio,video,usb,cdrom,tty -m <username>
Delete user
root # userder -r <username>
List groups
user $ groups user $ groups <username>
List users
user $ users
Add user to group
root # gpasswd -a <user> <group>
Remove user from group
root # gpasswd -d <user> <group>
Add new group
root # groupadd <group>
Delete group
root # groupdel <group>
File permissions
You can change file permissions with chmod.
user $ chmod <r><g><u> <file>
<r> = number for root permissions <g> = number for group permissions = 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)
Change owner and group of file
You can change owner and group of file with chown.
root # chown <user>:<group> <file>
You can change owner of folder and files inside recursively with:
root # chown -R <user>:<group> <folder>