How to view all user and group information in linux

1. [Step 1] cat /etc/passwd

   cat /etc/passwd to view all user information, the details are as follows

   
2. 2

   [Step 2] cat /etc/passwd|grep username

   cat /etc/passwd|grep username, used to find a user, as shown below

   
3. 3

   [Step 3] cat /etc/group

   cat /etc/group to view all group information, as shown below

   
4. 4

   [Step 4] cat /etc/group|grep group name

   cat /etc/group|grep Group name, used to find a user group, as shown below

   
5. 5

   [Step 5] Common commands for users and groups

   groups View the group members of the currently logged in user

   groups test View the group where the test user is located, and the members in the group

   whoami View the current login user name