• The rem command does not display comments on the screen. You must use the echo on command in your batch or CONFIG.SYS file to display comments on the screen.
  
  
• You cannot use a redirection character (< or >) or pipe (|) in a batch file comment.
  
  
• Although you can use rem without a comment to add vertical spacing to a batch file, you can also use blank lines. Blank lines are ignored when a batch program is processed.
  
  

The following example shows a batch file that uses remarks for comments and for vertical spacing:

@echo off
rem  This batch program formats and checks new disks.
rem  It is named Checknew.bat.
rem
rem echo Insert new disk in Drive B.
pause 
format b: /v chkdsk b: 

To include an explanatory comment before the prompt command in your CONFIG.SYS file, add the following lines to CONFIG.SYS:

rem Set prompt to indicate current directory
prompt $p$g