To list all users in the system in Linux, you can use the getent command. This command can be used to retrieve entries from various databases, such as the passwd, shadow, and group databases.
To list all users in the system, you can use the following syntax:
$ getent passwd
This will print the user name, user ID, group ID, home directory, and shell for all users in the system.
You can also use the awk command to extract specific fields from the output of the getent command. For example, to list just the user names of all users in the system, you can use the following command:
$ getent passwd | awk -F: '{print $1}'
This will extract the first field (the user name) from the output of the getent command and print it.
You can also use the cut command to extract specific fields from the output of the getent command. For example, to list just the user names of all users in the system, you can use the following command:
$ getent passwd | cut -d: -f1
This will extract the first field (the user name) from the output of the getent command and print it.
Finally, you can use the /etc/passwd file to list all users in the system. This file contains information about all users in the system, including their user names, user IDs, group IDs, home directories, and shells.
To list all users in the system using the /etc/passwd file, you can use the following command:
$ cat /etc/passwd
This will display the contents of the /etc/passwd file, including the user names, user IDs, group IDs, home directories, and shells for all users in the system.