Removing insecure examples of wpa_passphrase (#927)

* Removing insecure examples of wpa_passphrase

The command `wpa_passphrase ssid password` should never be used or suggested to any noob, since shell will put the line into the history, from which the password can be easily recovered along with the ssid. wpa_passphrase is not designed to be used in that way, since it will ask for the password if not added as paramter, and that input will not be stored anywhere. The ability to be able to use commands with passwords only designed for scripts they SHOULD NOT BE USED in a terminal (where history of commands being logged).

* copy edits

* copy edits

configuration/wireless/wireless-cli.md

@@ -34,7 +34,7 @@ network={
     psk="testingPassword"
 }
 ```
-The password can be configured either as the ASCII representation, in quotes as per the example above, or as a pre-encrypted 32 byte hexadecimal number. You can use the `wpa_passphrase` utility to generate an encrypted PSK. This takes the SSID and the password, and generates the encrypted PSK. With the example from above, you can generate the PSK with `wpa_passphrase "testing" "testingPassword"`. The output is as follows.
+The password can be configured either as the ASCII representation, in quotes as per the example above, or as a pre-encrypted 32 byte hexadecimal number. You can use the `wpa_passphrase` utility to generate an encrypted PSK. This takes the SSID and the password, and generates the encrypted PSK. With the example from above, you can generate the PSK with `wpa_passphrase "testing"`. Then you will be asked for the password of the WiFi network (in this case `testingPassword`). The output is as follows:
 
   ```
   network={
@@ -47,7 +47,11 @@ Note that the plain text version of the code is present, but commented out. You
 
 The `wpa_passphrase` tool requires a password with between 8 and 63 characters. For more complex passphrases you can extract the content of a text file and use it as input for `wpa_passphrase`, if the password is stored as plain text inside a file somewhere, by calling `wpa_passphrase "testing" < file_where_password_is_stored`. For extra security, you should delete the `file_where_password_is_stored` afterwards, so there is no plain text copy of the original password on the system.
 
-If you are using the `wpa_passphrase` encrypted PSK you can either copy and paste the encrypted PSK into the `wpa_supplicant.conf` file,  or redirect the tools output to your configuration file by calling `wpa_passphrase "testing" "testingPassword" >> /etc/wpa_supplicant/wpa_supplicant.conf`. Note that this requires you to change to `root` (by executing `sudo su`), or you can use `wpa_passphrase "testing" "testingPassword" | sudo tee -a /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null`, which will append the passphrase without having to change to `root`. Both methods provide the necessary administrative privileges to change the file. Lastly, make sure you use `>>`, or use `-a` with `tee`, (both can be used to append text to an existing file) since `>`, or omitting `-a` when using `tee`, will erase all contents and **then** append the output to the specified file. Note that the redirection to `/dev/null` at the end of the second form simply prevents `tee` from **also** outputting to the screen (standard output).
+To use the `wpa_passphrase`–encrypted PSK, you can either copy and paste the encrypted PSK into the `wpa_supplicant.conf` file, or redirect the tools output to the configuration file in one of two ways:
+- Either change to `root` by executing `sudo su`, then call `wpa_passphrase "testing" >> /etc/wpa_supplicant/wpa_supplicant.conf` and enter the testing password when asked
+- Or use `wpa_passphrase "testing" | sudo tee -a /etc/wpa_supplicant/wpa_supplicant.conf > /dev/null` and enter the testing password when asked; the redirection to `/dev/null` prevents `tee` from **also** outputting to the screen (standard output)
+
+If you want to use one of these two options, **make sure you use `>>`, or use `-a` with `tee`** — either will **append** text to an existing file. Using a single chevron `>`, or omitting `-a` when using `tee`, will erase all contents and **then** append the output to the specified file.
 
 Now save the file by pressing `Ctrl+X`, then `Y`, then finally press `Enter`.