PROMPT

Change the cmd.exe command prompt.

Syntax
      PROMPT [text] 
   
Key
   text : a text string.

The prompt text can be made up of normal characters and the following special codes:

   $A  &           (Ampersand) 
   $B  |           (pipe) 
   $C  (           (Left parenthesis) 
   $D Current date 
   $E Escape code  (ASCII code 27) 
   $F  )           (Right parenthesis) 
   $G  >           (greater-than sign) 
   $H  Backspace   (erases previous character) 
   $L  <           (less-than sign) 
   $M  Display the remote name for Network drives
   $N  Current drive 
   $P  Current drive and path 
   $Q  =           (equal sign) 
   $S              (space) 
   $T  Current time 
   $V  Windows NT version number 
   $_  Carriage return and linefeed 
   $$  $           (dollar sign)
   $+  Will display plus signs (+) one for each level of the PUSHD directory stack

Examples

Display the UNC path whenever you are using a network drive (mapped with NET USE)
PROMPT $M$_$P$G

Simulate an HP-UX style prompt with the computername and the current folder on separate lines:
PROMPT=$p$_%username%@%computername%:.

Restore the default prompt:
PROMPT $P$G

PROMPT is implemented as a hidden environment variable called PROMPT: ECHO %prompt%
Knowing this you can force a permanent change in the CMD prompt for all sessions by setting a permanent environment variable with the appropriate prompt text. e.g.

SETX PROMPT $M$_$P$G

You can also create a shortcut to the command prompt like this:
CMD /K PROMPT $M$_$P$G

If Command Extensions are disabled the commands $M and $+ are not supported.

Related:

SETX - Set an environment variable permanently.
Powershell: Create a function called Prompt (save in Profile.ps1 to make permanent)
Equivalent bash command (Linux): variable $PROMPT_COMMAND