how to set a username and a password on same command line linux debian 9 code example

Example 1: change linux user password

#if you dont't have your root password => then don't use sudo command

# passwd <username>
Current password:
New password:
Retype new password:
passwd: password updated successfully

Example 2: how to change password in linux

# sudo passwd <username>
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully