The userdel command allows you to delete users. It undoes most, but not all, of what the useradd command does.See the steps below for instructions.

1. Before you remove a user, take note of the user’s ID number since you may need to know this later. Look at the third field of the user’s entry in /etc/passwd. For example, you can see in this line from the password file that user joe has user ID 100:

joe:x:100:100: :/home/joe:/bin/bash

2. As root, run the userdel command with the username of the user you wish to remove. (Keep in mind that you cannot remove an account if the user is logged in.)

3. By default, userdel will not remove any of the user’s files. To remove the user’s home directory automatically, use the -r option. For example:

# userdel -r joe

If you do not use the -r option, you will need to remove the user’s home directory manually:

# rm -rf /home/joe/

The user may have other files on the system which userdel has not removed. Particularly, look in the /var/spool directory. You might want to remove old mail, for example. Also, the user may have installed a crontab file. Here is how you would remove these things:

# rm fvarfspooi/mail/joe
#rm Ivarlspooilcronltabs/joe

4. It is possible that the user still has some jobs running. Rather than rebooting, you can search for and kill any jobs left running by the user. The user no longer exists in the password file so you cannot search by the user’s name. Instead, search for jobs owned by the user ID you found in Step 1. Here is an example of killing a job that Joe left running:

# ps —user 100

PID TTY TIME CMD

1490 ? 00:06:21 mydaemon

# kill —9 1490

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The userdel command allows you to delete users. It undoes most, but not all, of what the useradd command does.See the steps below for instructions.

1. Before you remove a user, take note of the user’s ID number since you may need to know this later. Look at the third field of the user’s entry in /etc/passwd. For example, you can see in this line from the password file that user joe has user ID 100:

joe:x:100:100: :/home/joe:/bin/bash

2. As root, run the userdel command with the username of the user you wish to remove. (Keep in mind that you cannot remove an account if the user is logged in.)

3. By default, userdel will not remove any of the user’s files. To remove the user’s home directory automatically, use the -r option. For example:

# userdel -r joe

If you do not use the -r option, you will need to remove the user’s home directory manually:

# rm -rf /home/joe/

The user may have other files on the system which userdel has not removed. Particularly, look in the /var/spool directory. You might want to remove old mail, for example. Also, the user may have installed a crontab file. Here is how you would remove these things:

# rm fvarfspooi/mail/joe
#rm Ivarlspooilcronltabs/joe

4. It is possible that the user still has some jobs running. Rather than rebooting, you can search for and kill any jobs left running by the user. The user no longer exists in the password file so you cannot search by the user’s name. Instead, search for jobs owned by the user ID you found in Step 1. Here is an example of killing a job that Joe left running:

# ps —user 100

PID TTY TIME CMD

1490 ? 00:06:21 mydaemon

# kill —9 1490

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