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+#passwd
+
+> passwd is a tool on most Unix and Unix-like operating systems used to change a user's password.
+
+* Change your password. ( You may need to use **sudo** ). The {{options}} flag can use -a, -d, -e, -h, -S, -i, -k, -l, -m , -q, -r, -u, -v, -x  as arguments.
+
+`passwd {{options}} {{new password}}`
+
+
+* Gives the current statuts of the user. The status information consists of 7 fields, sutch as the password status, the username, the date, the age etc...   
+
+`passwd -S`
+
+* Make the password of the account blank ( It will set the named account passwordless. )
+
+`passwd -d`
+
+* Change the password of the specified user.
+
+`passwd {{username}} {{new password}}`