The shadow-utils package includes the necessary programs for
converting UNIX password files to the shadow password format, plus
programs for managing user and group accounts. The pwconv command
converts passwords to the shadow password format. The pwunconv command
unconverts shadow passwords and generates an npasswd file (a standard
UNIX password file). The pwck command checks the integrity of
password and shadow files. The lastlog command prints out the last
login times for all users. The useradd, userdel and usermod commands
are used for managing user accounts. The groupadd, groupdel and
groupmod commands are used for managing group accounts.