Passwd
TOOL ON MOST UNIX AND UNIX-LIKE OPERATING SYSTEMS USED TO CHANGE A USER'S PASSWORD
Shadow (file); Shadow passwords; Password shadowing; Shadowed password; Password Shadowing; Passwd (command); Passwd (file); /etc/passwd; /etc/shadow; Shadow password; Password file; /etc/master.passwd; Shadow file
passwd is a command on Unix, Plan 9, Inferno, and most Unix-like operating systems used to change a user's password. The password entered by the user is run through a key derivation function to create a hashed version of the new password, which is saved.