How to view users in the system?

There are several ways to view users in the system.

Viewing the contents of the /etc/passwd file:
```
cat /etc/passwd
```
This file contains entries for each user, with each line representing a user and including, among other things, their username and home directory.
Using the getent command:
```
getent passwd
```
This command retrieves entries from the Name Service Switch database, which may include information from /etc/passwd, LDAP, and other sources.
Using the id command:
```
id <username>
```
This command shows information about a specific user, including their UID, GID, and groups. To view information about the current user:
```
id
```
Using the who command:
```
who
```
This command shows which users are currently logged in.
Using the w command:
```
w
```
This command is similar to who but provides more detailed information about what the users are doing.

To get a list of all users, including system users, usually cat /etc/passwd or getent passwd is used. To get information about a specific user, use id. To view active sessions, use who or w.