Cheatsheet & Examples: passwd
Change Password for Current User
Example Usage:passwd
What it does:
Changes the password for the current user.
Command-line Arguments Explained:
--stdin(optional): Reads password from standard input (not recommended for security).--show(optional): Displays the password in a simplified format (e.g.,*).--no-e(optional): Disables password expiration.--no-s(optional): Disables showing password in simple format.--help(optional): Displays help information.--version(optional): Displays version information.
Lock Account
Example Usage:passwd -l
What it does:
Locks the current user account to prevent unauthorized access.
Command-line Arguments Explained:
-l(required): Locks the account.
Unlock Account
Example Usage:passwd -u
What it does:
Unlocks a locked account.
Command-line Arguments Explained:
-u(required): Unlocks the account.
Set Password Expiration Date
Example Usage:passwd -e
What it does:
Sets the password expiration date for the current user.
Command-line Arguments Explained:
-e(required): Sets the expiration date.-x(optional): Sets the number of days until the password expires.-n(optional): Sets the number of days before the password expires.
Delete Previous Password
Example Usage:passwd -d
What it does:
Deletes the previous password and prompts for a new one.
Command-line Arguments Explained:
-d(required): Deletes the previous password.
Use Standard Input for Password
Example Usage:passwd -stdin
What it does:
Reads the password from standard input (not recommended for security).
Command-line Arguments Explained:
-stdin(optional): Reads password from standard input.
Show Password in Simple Format
Example Usage:passwd -s
What it does:
Displays the password in a simplified format (e.g., *).
Command-line Arguments Explained:
-s(optional): Shows password in simple format.
Change Password for Another User
Example Usage:passwd -u <username>
What it does:
Changes the password for a specified user.
Command-line Arguments Explained:
-u(required): Specifies the user to change the password for.<username>(optional): The username of the target user.
Set Password Expiration Days
Example Usage:passwd -x <days>
What it does:
Sets the number of days until the password expires.
Command-line Arguments Explained:
-x(required): Sets the number of days until the password expires.<days>(optional): The number of days.
Set Password Expiration Before Next Date
Example Usage:passwd -n <days>
What it does:
Sets the number of days before the password expires.
Command-line Arguments Explained:
-n(required): Sets the number of days before the password expires.<days>(optional): The number of days.
