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Updated: April 17, 2012

Applies To: Windows Server 2003, Windows Vista, Windows XP, Windows Server 2008, Windows 7, Windows Server 2003 R2, Windows Server 2008 R2, Windows Server 2000, Windows Server 2012, Windows 8

Records comments (remarks) in a batch file or CONFIG.SYS. If no comment is specified, rem adds vertical spacing.

For examples of how to use this command, see Examples.

rem [<Comment>]




Specifies a string of characters to include as a comment.


Displays help at the command prompt.

  • 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 echo Insert new disk in Drive B.
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