Ubuntu User/user group management

1: View all groups of users

Cat  /etc/group
ftpgroup:x:1001:ftpadmin

Ftpgroup is a user group and ftpadmin is a user of this group

1) Create user groups

Groupadd Ftpgroup

2) Delete user group

Groupdel Ftpgroup

2: View Users

Cat/etc/shadow
ftpadmin:$6$8qc/zlcz$zan/ Nx.dg5o4lb87z86gpsmnhvghdynvc1tt0m.nraurw.5rfrfowj9ngp6gpzuwqvmjrihx.. Hd7awpyjzuy/:15678:0:99999:7:::

Ftpadmin is the user name

1) Create user

Useradd ftpadmin-d/usr/local/tomcat/apache-tomcat-7.0.33/webapps/-G ftpgroup

passwd ftpadmin  //Set Password

-d Specifies the user's home directory

The group to which-G belongs.

But when I performed cat/user/group, I found that there was no user ftpadmin

FTPGROUP:X:1001:

So I executed 3 of the instructions I wrote.

2) Delete User

Userdel Ftpadmin

3: Add the user to the specified user group

Gpasswd-a ftpadmin ftpgroup
Adding user ftpadmin to group Ftpgroup

4: View the user and the user's home directory and other information

VI  /etc/passwd

User
Ftpadmin:x:1001:1001::/usr/local/tomcat/apache-tomcat-7.0.33/webapps/:/sbin/nologin