Batch Programming Elements
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Scan day: 02 March 2014 UTC
-525
Virus safety - good
Description: Collection of batch language enhancers in batch language by Dirk van Deun.
------------------------------------------------------------ BATCH PROGRAMMING ELEMENTS A collection of batch language enhancers in batch language Collected by Dirk van Deun Programs and longer quotations (re)published with permission ------------------------------------------------------------ "In der Beschraenkung zeigt sich erst der Meister." (Goethe) ------------------------------------------------------------ If you want extra information, if you have found a bug or developed a better routine, mail me at dvandeun at vub.ac.be ------------------------------------------------------------ Date of last revision: June 7, 1996 ------------------------------------------------------------ ----------- PROLEGOMENA ----------- Not all batch files in this collection are easy too understand for the beginner. If you are not already a batch file fanatic, it might be better to read http://student.vub.ac.be/~dvandeun/batvirus.all first, which contains quite a few useful digressions which I did not repeat here. However, all batch files in this text can be understood with the help of your MS-DOS manual, if you know these three undocumented or barely documented facts: 1. Starting a line with :: has the same function as starting a line with REM, only it executes faster, because REM is a DOS command, and DOS preprocesses it (interpreting >, file creates a 0 byte file, and :: > file doesn't. 2. FOR %a IN (/ABCD) is functionally equivalent with FOR %a IN (A BCD): in a FOR argument DOS splits a word preceded with a slash in two parts: the first letter, and the rest. If you do not see the use of this, note that the slash can also be used with variables and command line parameters: in FOR %a IN (/%VAR%), %VAR% is interpreted first, and then the first letter is cut off. 3. ECHO. displays an empty line; ECHO without the dot gives the status of echo: 'echo is on' or 'echo is off'. ECHO.%1 will display only the contents of %1, or an empty line if %1 is empty. Remember that this is a collect
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