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Linux passwd command

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Linux passwd command to change a user's password

grammar 

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

Necessary parameters:

  • -d remove the password
  • -f enforcement
  • -k update can only be sent after the expiration
  • -l stop using the account
  • -S Display password information
  • -u Enable account has been stopped
  • -x Set Password Validity
  • -g group password modification
  • -i expired user account is stopped

Selection parameters:

  • --help display help information
  • --version display version information

Examples

Change password 

# passwd w3cschool  //设置w3cschool用户的密码
Enter new UNIX password:  //输入新密码，输入的密码无回显
Retype new UNIX password:  //确认密码
passwd: password updated successfully
#

Display account password information 

# passwd -S w3cschool
w3cschool P 05/13/2010 0 99999 7 -1

Delete a user password 

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

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