Linux passwd Command

The Linux passwd command is used to change a user's password.

Syntax

passwd [-k] [-l] [-u [-f]] [-d] [-S] [username]

Required Parameters:

-d Delete password
-f Force the user to change the password on the next login
-w Number of days warning before the password expires
-k Update only after expiration
-l Lock the account
-S Display password information
-u Unlock the disabled account
-x Specify the maximum password age
-g Change the group password
Specify the minimum password age
-i Number of days after password expiration until the account is disabled

Optional Parameters:

--help Display help information
--version Display version information

Examples

Change user password

# passwd tutorialpro  //Set the password for the tutorialpro user
Enter new UNIX password:  //Enter the new password, no echo
Retype new UNIX password:  //Confirm the password
passwd: password updated successfully
#

Display account password information

# passwd -S tutorialpro
tutorialpro P 05/13/2010 0 99999 7 -1

Delete user password

# passwd -d lx138 
passwd: password expiry information changed.

Linux Command Manual

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