chpasswd: add page (#8145)

pages/linux/chpasswd.md

@@ -0,0 +1,20 @@
+# chpasswd
+
+> Change the passwords for multiple users by using stdin.
+> More information: <https://manned.org/chpasswd.8>.
+
+- Change the password for a specific user:
+
+`printf "{{username}}:{{new_password}}" | sudo chpasswd`
+
+- Change the passwords for multiple users (The input text must not contain any spaces.):
+
+`printf "{{username_1}}:{{new_password_1}}\n{{username_2}}:{{new_password_2}}" | sudo chpasswd`
+
+- Change the password for a specific user, and specify it in encrypted form:
+
+`printf "{{username}}:{{new_encrypted_password}}" | sudo chpasswd --encrypted`
+
+- Change the password for a specific user, and use a specific encryption for the stored password:
+
+`printf "{{username}}:{{new_password}}" | sudo chpasswd --crypt-method {{NONE|DES|MD5|SHA256|SHA512}}`