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2. Group

2.1. Add a new group

$ groupadd newgroup
			

2.2. Add a user to the group

$ groupadd mygroup
$ sudo usermod -a -G mygroup user		
			

2.3. /etc/group

[root@test ~]# cat /etc/group
root:x:0:root
bin:x:1:root,bin,daemon
daemon:x:2:root,bin,daemon
sys:x:3:root,bin,adm
adm:x:4:root,adm,daemon
tty:x:5:
disk:x:6:root
lp:x:7:daemon,lp
mem:x:8:
kmem:x:9:
wheel:x:10:root
mail:x:12:mail
news:x:13:news
uucp:x:14:uucp
man:x:15:
games:x:20:
gopher:x:30:
dip:x:40:
ftp:x:50:
lock:x:54:
nobody:x:99:
users:x:100:
nscd:x:28:
floppy:x:19:
vcsa:x:69:
pcap:x:77:
utmp:x:22:
utempter:x:35:
slocate:x:21:
audio:x:63:
rpc:x:32:
mailnull:x:47:
smmsp:x:51:
ecryptfs:x:101:
sshd:x:74:
rpcuser:x:29:
nfsnobody:x:4294967294:
dbus:x:81:
avahi:x:70:
haldaemon:x:68:
avahi-autoipd:x:102:
neo:x:500:
mysql:x:501:
			
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