I used the 'useradd' command to create a new account, but I did so without specifying the password. Now, when the user tries to log in, it asks him for a password. If I didn't set it up initially, how do I set the password now?
Easiest way to do this from the command line is to use the
passwd command with root privileges.
man 1 passwd
NAME passwd - update user's authentication token SYNOPSIS passwd [-k] [-l] [-u [-f]] [-d] [-n mindays] [-x maxdays] [-w warndays] [-i inactivedays] [-S] [--stdin] [username] DESCRIPTION The passwd utility is used to update user's authentication token(s).
After you set the user password, you can force the user to change it on next login using the
chage command (also with root privileges) which expires the password.
chage -d 0 username
When the user successfully authenticates with the password you set, the user will automatically be prompted to change it. After a successful password change, the user will be disconnected, forcing re-authentication with the new password.
man 1 chage for more information on password expiry.
After adding new user if you are loggedin as a 'root' then you can set the password using command
Or, if you are not root, you can run
sudo passwd <username>
To set the password.
Or if you are root then you can 'su' to the user and run 'passwd' to set the password.
su <username> passwd