Batch Files: Examples. Batch file examples; Name Version Description OS. Demo batch file for LeftPad and RightPad subroutines, both written to format strings to be displayed in colums on screen: NT. Using multiple IF statements in a batch file. But if you want more granular control later in your batch file you can record the result for each file as I have done. Triple IF Statement in Windows Batch File? IF and IF.
Using multiple IF statements in a batch fileis there a special guideline that should be followed. There is no "standard" way to do batch files, because the vast majority of their authors and maintainers either don't understand programming concepts, or they think they don't apply to batch files. But I am a programmer. I'm used to compiling, and I'm used to debuggers.
Batch files aren't compiled, and you can't run them through a debugger, so they make me nervous. I suggest you be extra strict on what you write, so you can be very sure it will do what you think it does. There are some coding standards that say: If you write an if statement, you must use braces, even if you don't have an else clause. This saves you from subtle, hard- to- debug problems, and is unambiguously readable. I see no reason you couldn't apply this reasoning to batch files. Let's take a look at your code.
IF EXIST somefile. IF EXIST someotherfile. SET var=somefile. And the IF syntax, from the command, HELP IF: IF [NOT] ERRORLEVEL number command. IF [NOT] string. 1==string. IF [NOT] EXISTS filename command.
These values can be literal strings or batch variables. use the following form of the original statement. ELSE echo filename. missing: Top of page. Examples. If the file Product.dat cannot be found, the following.
IF EXIST filename (. So you are chaining IF's as commands.
Batch Techniques; Batch HowTos; Commands. IF statements. General. that you will lose one file handle for each directory you perform this check on, since this check opens the. BATCH FILE EXAMPLES Examples Preliminary. Here are example batch files. when no file names are left, the 'IF NOT' statement becomes false because '%1' will by then actually be equal to nothing. A batch file is an unformatted text file that contains one or more commands and has a.bat or.cmd file name extension. Using batch files. With batch files, which are also called batch programs or scripts, you can. Batch File Tutorial 'What is a batch file and why might. you'll be shown examples of more complicated batch files which use command. Enter 'MENU' to display the menu (remembering to have C:\BATCH in the path statement.). I have a batch file that needs to apply the attrib +h command to a file. Batch Files. IF statements? Batch file “If” statement errors.
If you use the common coding- standard rule I mentioned above, you would always want to use parens. Here is how you would do so for your example code: IF EXIST "somefile. IF EXIST "someotherfile. SET var="somefile. Make sure you cleanly format, and do some form of indentation.
You do it in code, and you should do it in your batch scripts. Also, you should also get in the habit of always quoting your file names, and getting the quoting right. There is some verbiage under HELP FOR and HELP SET that will help you with removing extra quotes when re- quoting strings. Edit. From your comments, and re- reading your original question, it seems like you want to build a comma separated list of files that exist. For this case, you could simply use a bunch of if/else statements, but that would result in a bunch of duplicated logic, and would not be at all clean if you had more than two files. A better way is to write a sub- routine that checks for a single file's existence, and appends to a variable if the file specified exists.
Then just call that subroutine for each file you want to check for: @ECHO OFF. REM Todo: Set global script variables here. CALL : Main. Script. REM Main. Script(). CALL : Add. If. Exists "somefile.
CALL : Add. If. Exists "someotherfile. ECHO. Files: %files%. REM Add. If. Exists(filename, existing. Filenames, return.
Variable. Name). IF EXIST "%~1" (. SET "result=%~1". SET "result=". REM Cleanup, and return result - concatenate if necessary. IF "%~2"=="" (. SET "%~3=%result%". SET "%~3=%~2,%result%".