Difference between revisions of "Batch"
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Revision as of 10:26, 3 December 2008
Batch files are the original ms-dos scripting language. A batch file is a script that contains a list of ms-dos commands, with one command per line. When you try to execute the batch file, it will execute the ms-dos commands, one after another, waiting for each command to finish before starting the next one.
Contents
Examples
For
The following example will output each line of the text file to the stdout:
> FOR /F %i in (list.txt) DO @echo %~ni
The following example will allow to parse and edit the environment variables:
> for /F %i in ('dir /B /S *_1.dat') do @set fil=%i & copy /Y !fil! !fil:1=2!
If you want to write FOR loops in a batch file instead of the command line, then use %%i instead of %i.
To place the first line of a file into a variable:
> SET /P _MyVar=<MyFilename.txt
To place the last line of a file into a variable:
> FOR /F "tokens=*" %A IN (C:\boot.ini) DO SET TestVar=%A
Nested FOR Loops
> FOR /F %a IN (filelist.txt) DO (FOR /F %b IN (salinitytemperature.txt) DO echo %a %b)
Nested FOR loops encapsulated in a batch file
for /F %%a in (%1) do (
for /R %%b in (../*) do (
echo %%a
echo %%b
)
)
Misc
Escaping characters
<,|,> and % characters are special characters in dos. To escape them use the ^ character or a double %
> echo ^<example^> <example>
Displaying blank lines
Use command echo to display a blank line instead of its default status result
>echo.
Sample applications
Here's a combination with a batch file, that creates a clean copy of a MOHID simulation:
> copysimulation MySimulation
#copysimulation.bat content #Input argument %1 stands for simulation name @echo off set COPYHOME=C:\Program Files\2gif xcopy %1\*.* %1_copy /E /EXCLUDE:%COPYHOME%\exclui.txt perl %COPYHOME%/replace.pl 's/%2/\.\.\/\.\./g' * perl %COPYHOME%/replace.pl 's/\\/\//g' * @echo on
