The passwd of Linux command detailed

Role: Modify user password

Format: passwd [options] [LOGIN]

Describe:

Ordinary users can only modify their own password, Superuser can modify the password of any account, can also change the validity of the relevant account password;

Superuser can not enter the password of the user to be modified;

Options:

-A,--All

Use with-S to show all user status

-D,--Delete

Delete User Password

-E,--expire

Disable the user's password immediately, forcing the user to modify the password at the next logon

-H,--Help

Display Help information and exit

-I,--inactive inactive

When the account expires inactive, users can no longer use the account login

-N,--mindays min_days

Password two times to modify the time at least interval min_days days, if Min_days is 0, it can be modified at any time

-S,--Status

Displays account status information, a total of 7 fields, namely login name, L (P or NP), last modified time, minimum age, maximum age, warning period, inactive period. The units of these ages are all days.

-W,--warndays warn_days

Warn Warn_days days before password expires

-X,--maxdays max_days

Set the maximum lifetime of a password

File:

/etc/passwd

User account information

/etc/shadow

Encrypt user account information

/etc/pam.d/passwd

Pam Configuration for passwd

Exit Value:

0: Success

1: Access Denied

2: Option binding is not valid

3: Unknown failure, nothing done

4: Unknown failure, passwd file missing

5:PASSWD file is occupied, try again

6: Option has invalid parameter

Example:

View all user Information

Sudo--status--all

Modify Current User Password

passwd