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Tips2Tricks for DOS batch

By ErikBachmann@ClicketyClick.dk

Latest update: 2022-02-28

String replacement using var

🔗 http://scripts.dragon-it.co.uk/scripts.nsf/docs/batch-search-replace-substitute!OpenDocument&ExpandSection=3&BaseTarget=East&AutoFramed

::	set string=This is my string to work with.
SET find=my string
SET replace=your replacement
CALL SET string=%%string:!find!=!replace!%%
ECHO %string%

OR failure

🔗 http://stackoverflow.com/a/334023

cls & dir
copy a b && echo Success
copy a b || echo Failure

Setting environment variables from a file

🔗 http://stackoverflow.com/a/1077250

Setting environment variables from a file with SET /P

:: dump windows version into file
ver |find ".">ver.tmp
:: read into env var
SET /P SVNVERSION=<ver.tmp

Type file content from command line

🔗 http://stackoverflow.com/a/534890

copy con o.bat
ECHO Hello world
[Ctrl]+[z]
o.bat

Will produce:

Hello World

ECHO without newline

🔗 http://stackoverflow.com/a/374361

@set /p any-variable-name=Hello<nul
@echo: world

Will produce:

Hello World

Nested variables

🔗 http://windowsitpro.com/article/articleid/82861/jsi-tip-8971-how-can-i-change-the-case-of-string-to-all-upper-case-or-all-lower-case.html 🔗 http://stackoverflow.com/a/3752322

SET extension=xxx
SET value=123
set somevalue=value
call set SomeEnvVariable_%extension%=%%%somevalue%%%
set SomeEnvVariable_

Will produce:

SomeEnvVariable_xxx=123

This is used in _toLowerCase.cmd

    SET _=%~2
    CALL :Lcase _
    @ENDLOCAL&SET %1=%_%
GOTO :EOF

:LCase
    FOR %%c IN (a b c d e f g h i j k l m n o p q r s t u v w x y z ‘ › †) DO CALL SET %1=%%%1:%%c=%%c%%
GOTO :EOF

Finding executable in PATH

🔗 http://stackoverflow.com/a/374363

for %i in (cmd.exe) do @echo. %~$PATH:i

Or

where cmd.exe

REM versus ::

:Link: http://ss64.com/nt/rem.html

:: is much faster to execute than ´REM. However be carefull not to use ::` inside blocks:

(
echo This example will fail
:: some comment Use REM instead
)

Exporting variables outside scope

🔗 http://stackoverflow.com/a/1077308

Local variables are still parsed for the line that ENDLOCAL uses. This allows for tricks like:

ENDLOCAL & SET MYGLOBAL=%SOMELOCAL% & SET MYOTHERGLOBAL=%SOMEOTHERLOCAL%

This is is a useful way to transmit results to the calling context. Specifically, %SOMELOCAL% goes out of scope as soon as ENDLOCAL completes, but by then %SOMELOCAL% is already expanded, so the MYGLOBAL is assigned in the calling context with the local variable.

Quick edit mode in cmd.exe [Ctrl]+[c] /[Ctrl]+[v]

🔗 http://stackoverflow.com/a/253456

reg add HKCU\Console /v QuickEdit /t REG_DWORD /d 1 /f

Redirecting

Forced to console

Redirecting to con: will force out to console

@ECHO OFF
(
  ECHO A
  ECHO B>con:
) >nul

Will produce

B

While A is send to nul

Arrays in Environment

@ECHO OFF
SETLOCAL ENABLEDELAYEDEXPANSION
SET no=0
FOR %%a IN (*.*) DO (
    CALL SET /A no+=1
    SET filelist.!no!=%%a
)
SET filelist

Will produce a numbered list of files like:

filelist.1=o.bat
filelist.2=p.cmd
filelist.3=q.cmd

Remove surrounding quote

http://stackoverflow.com/a/5419228

for /f "useback tokens=*" %%a in ('%str%') do set str=%%~a