lpasswd - Unix, Linux Command

NAME

lpasswd - Change group or user password.

SYNOPSIS

 lpasswd [OPTION]... [name]

DESCRIPTION

lpasswd Changes password of user or group name.If the name argument is not provided, username of the invoking user is used; the name argument is ignored if lpasswd is run set-uid to a different user. Entering an empty password (by pressing Enter) aborts the password setting operation.

Options

Tag	Description
-F, --plainpassword-fd=fd	Read password from file descriptor fd, terminated by end of file, '\r' or '\n'.
-f, --password-fd=fd	Read password hash from file descriptor fd, terminated by end of file, '\r' or '\n'.
-g, --group	Change password of group name. By default the password of user name is changed.
-i, --interactive	Ask all questions when connecting to the user database, even if default answers are set up in libuser configuration.
-P, --plainpassword=password	Set the password to password. Note that the password can be viewed while running lpasswd using tools such PS1
-p, --password=encrypted	Set the password to the password represented by the hash encrypted.

EXAMPLES

Example-1:

Change Password of System Users:

$ lpasswd

output:

 Changing password for user ubuntu.
 Changing password for ubuntu.
 (current) UNIX password:
 New password:
 Retype new password:
 passwd: all authentication tokens updated successfully.
 
 Note: When you logged in as root user and run passwd command then it will reset the root
 password by default and if you specify the user-name after passwd command then it 
 will change the password of that user.

# lpasswd
# lpasswd ubuntu

Example-2:

Display Password Status Information:

# lpasswd -S ubuntu

output:

linuxtechi PS 2017-01-20 0 99999 7 -1 (Password set, SHA512 crypt.)

Example-3:

Removing Password of a User using -d option

# lpasswd -d ubuntu

output:

 Removing password for user ubuntu.
 passwd: Success
 
 # lpasswd -S ubuntu
 ubuntu NP 2017-01-20 0 99999 7 -1 (Empty password.)

Example-4:

Set Password Expiry Immediately , ‘-e’ option in passwd command to expire user’s password immediately ,

# lpasswd -e ubuntu

output:

   Expiring password for user ubuntu
   passwd: Success
   
   # lpasswd -S ubuntu
   ubuntu PS 1970-01-01 0 99999 7 -1 (Password set, SHA512 crypt.)

Example-5:

Lock the password of System User

# lpasswd -l ubuntu

output:

 Locking password for user ubuntu.
 passwd: Success
 # lpasswd -S ubuntu
 LK 2017-01-20 0 99999 7 -1 (Password locked.)

Example-6:

Unlock User’s Password using -u option

# lpasswd -u ubuntu

output:

Unlocking password for user ubuntu.
passwd: Success

Example-7:

Setting inactive days using -i option

# lpasswd -i 10 ubuntu

output:

Adjusting aging data for user ubuntu.
passwd: Success

# lpasswd -S ubuntu
ubuntuPS 2017-01-20 0 99999 7 10 (Password set, SHA512 crypt.)

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