EV: DOS batch commands

echo .

echo "my comments"

echo %windir%   显示windows variables/环境变量

type readme.txt

 

copy con/IO

-------------------------

copy con output.txt Copy from Console to ...

After you type this command and press ENTER, MS-DOS copies everything you type to the file OUTPUT.TXT. When you are finished typing, press CTRL+Z to indicate that you want to end the file. The Control-Z character will appear on the screen as " ^Z ". You can also end a COPY CON command by pressing the F6 key. Pressing F6 also generates the Control-Z character; a "^Z" still appears on the screen.

copy con lpt1 Copies information from the keyboard to a printer connected to LPT1

 

wait/delay/pause

---------------------------

pause

timeout /t 10

 

error handle/handling

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call Batch1.bat
if %ERRORLEVEL% NEQ 0 goto failed
echo ...Completed Batch1, %ERRORLEVEL%

call Batch2.bat
if %ERRORLEVEL% NEQ 0 goto failed
echo ...Completed Batch2, %ERRORLEVEL%

Call Batch3.bat
if %ERRORLEVEL% NEQ 0 goto failed
echo ...Completed Batch3, %ERRORLEVEL%

goto end

:failed
echo ....ERROR Please check logs for further details, %ERRORLEVEL%

:end
endlocal

========================================

------------startsql.bat-------------

@echo off

if ""%1"" == """" goto startsql
echo Waiting for %1 seconds...
sleep %1

:startsql
echo Starting sql server service...
net start MSSQL$SQL2012

pause

------------end of startsql.bat-------------

========================================

REM

In a batch file REM at the start of a line signifies a comment or REMARK, alternatively adding :: at the start of a line has a similar effect.

For example:

@ECHO OFF
::
:: First comment

REM Second comment
REM

Echo Hello REM This remark is displayed by echo
Echo Hello & REM This remark is ignored by echo

Copy work.xls backup.xls &:: We backed up the file

Although you can use Rem without a comment to add vertical spacing to a batch file, you can also use completely blank lines. The blank lines are ignored when processing the batch program.

The double-colon is not documented as a comment command, it is a special case of a label that acts as a comment.

An alternative approach is to use plain text and a goto command to jump execution past the comments:

@Echo OFF
Goto :START

Description can go here
which can even include - | > characters

:START

 http://ss64.com/nt/rem.html

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