Query passwords with 'read -r'

'read' without '-r' interprets escape sequences, so it may not behave
properly if the password contains literal backslashes (depending on the
next character).

user/how-to-guides/backup-emergency-restore-v4.md

@@ -111,7 +111,7 @@ Emergency Recovery Instructions
     required, it will be handy later and will avoid saving the passphrase in
     the shell's history.
 
-        [user@restore ~]$ read backup_pass
+        [user@restore ~]$ read -r backup_pass
 
  3. Verify the integrity of `backup-header`. For compatibility reasons,
     `backup-header.hmac` is an encrypted *and integrity protected*

user/security-in-qubes/yubi-key.md

@@ -72,7 +72,7 @@ To use this mode you need to:
     (This way your password will not leak to the terminal command history file.)
 
     ```
-    read password
+    read -r password
     ```
 
     Now run the following command to calculate your hashed password.