Passwd for Linux Commands

& Amp; 65279; & amp; 65279; role: change user password & amp; 26684; formula: passwd [options] [LOGIN] description: normal users can only change their own passwords; A super user can change the password of any account or the validity period of the password. a super user can

Purpose: modify the user password.

Format: passwd [options] [LOGIN]

Description:

Normal users can only change their own passwords. super users can change the passwords of any account or change the validity period of the passwords;

Super users do not need to enter the password of the user to be modified;

Option:

-A, -- all

Used with-S to display the status of all users

-D, -- delete

Delete user password

-E, -- expire

Immediately invalidates the user password and forces the user to change the password upon next login

-H, -- help

Show Help information and exit

-I, -- inactive INACTIVE

After the account becomes INACTIVE, the user cannot use the account to log on again.

-N, -- mindays MIN_DAYS

The password must be modified at least within MIN_DAYS. if MIN_DAYS is 0, the password can be modified at any time.

-S, -- status

The account status information is displayed in seven fields: logon name, L (P or NP), Last modification time, minimum age, maximum age, warning period, and inactive period. The units of these ages are all days.

-W, -- warndays WARN_DAYS

WARN_DAYS days warning before password failure

-X, -- maxdays MAX_DAYS

Set the maximum password validity period

File:

/Etc/passwd

User account information

/Etc/shadow

Encrypt user account information

/Etc/pam. d/passwd

PAM configuration of passwd

Exit value:

0: Successful

1: Access Denied

2: invalid option combination

3: Unknown failure, nothing done

4: Unknown failure, passwd file loss

5: The passwd file is occupied. try again

6: The option has invalid parameters.

Example:

View all user information

Sudo -- status -- all

Change current user password

Passwd