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passwd

The `passwd` command is used to change the user password.

Username

Leave it blank for the current user

Use all supported algorithms to generate passwords. (-a)

Delete the password, rendering the user account unusable. (-d)

Disable the user account after the password has expired. (-e)

Display help information and exit. (-h)

Set the number of days after password expiration before the account is disabled. (-i)

This option only applies to AIX systems. (-k)

Lock the password for the specified user account. (-l)

Set the number of days that a user cannot change their password. (-n)

Reduce the complexity requirements of the password. (-q)

Set the minimum age of the user's password. (-r)

This option only applies to SUSE systems. (-R)

Display the password status of the specified user account. (-S)

Unlock the password for the specified user account. (-u)

Display a warning N days prior to password expiration. (-w)

Example

Change the password for the current user: passwd
Change the password for user "john": passwd john
Change the password for user "john" but disallow passwords previously used by john: passwd -n 3 john
Change the password for user "john" but disallow the new password to be the same as the old password: passwd -n 1 -r n john
Disable the password for user "john": passwd -l john