shadow

The shadow 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.