http://pkg-shadow.alioth.debian.org/
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 a passwd 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.
General Commands | Command | Description |
| chage | change user password expiry information |
| gpasswd | administer /etc/group and /etc/gshadow |
| newgidmap | set the gid mapping of a user namespace |
| newgrp | log in to a new group |
| newuidmap | set the uid mapping of a user namespace |
| sg | execute command as different group ID |
System Administration | Command | Description |
| adduser | alias for useradd |
| chgpasswd | update group passwords in batch mode |
| chpasswd | update passwords in batch mode |
| groupadd | create a new group |
| groupdel | delete a group |
| groupmems | administer members of a user's primary group |
| groupmod | modify a group definition on the system |
| grpck | verify integrity of group files |
| grpconv | alias for pwconv |
| grpunconv | alias for pwconv |
| lastlog | reports the most recent login of all users or of a given user |
| newusers | update and create new users in batch |
| pwck | verify integrity of password files |
| pwconv | convert to and from shadow passwords and groups |
| pwunconv | alias for pwconv |
| useradd | create a new user or update default new user information |
| userdel | delete a user account and related files |
| usermod | modify a user account |
| vigr | alias for vipw |
| vipw | edit the password, group, shadow-password or shadow-group file |