Man Pages in passwd

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Section 1: Executable programs or shell commands

chage.1

Change user password expiry information

chfn.1

Change real user name and information

chsh.1

Change login shell

expiry.1

Check and enforce password expiration policy

gpasswd.1

Administer /etc/group and /etc/gshadow

passwd.1

Change user password
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Section 5: File formats and conventions

gshadow.5

Shadowed group file

passwd.5

The password file

shadow.5

Shadowed password file

subgid.5

The subordinate gid file

subuid.5

The subordinate uid file
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Section 8: System administration commands

chgpasswd.8

Update group passwords in batch mode

chpasswd.8

Update passwords in batch mode

cppw.8

Copy with locking the given file to the password or group file

groupadd.8

Create a new group

groupdel.8

Delete a group

groupmod.8

Modify a group definition on the system

grpck.8

Verify integrity of group files

newusers.8

Update and create new users in batch

pwck.8

Verify integrity of password files

pwconv.8

Convert to and from shadow passwords and groups

shadowconfig.8

Toggle shadow passwords on and off

useradd.8

Create a new user or update default new user information

userdel.8

Delete a user account and related files

usermod.8

Modify a user account

vipw.8

Edit the password, group, shadow-password or shadow-group file