I have a question about if - else structure in a batch file. Each command runs individually, but I couldn't use "if - else" blocks safely so these parts of my programme doesn't work. How ...
Addendum - This is a duplicate question with nearly identical answers to Using an OR in an IF statement WinXP Batch Script Final addendum - I almost forgot my favorite technique to test if a variable is any one of a list of case insensitive values.
The batch size should pretty much be as large as possible without exceeding memory. The only other reason to limit batch size is that if you concurrently fetch the next batch and train the model on the current batch, you may be wasting time fetching the next batch (because it's so large and the memory allocation may take a significant amount of time) when the model has finished fitting to the ...
FOR %%A IN (list) DO command parameters list is a list of any elements, separated by either spaces, commas or semicolons. command can be any internal or external command, batch file or even - in OS/2 and NT - a list of commands parameters contains the command line parameters for command. In this example, command will be executed once for every element in list, using parameters if specified. A ...
It's the same as 'if "%1" == "" goto somewhere', except that will fail in batch files, because "" evaluates to nothing and the whole sentence reduces to 'if %1 == goto somewhere'. I prefer X, since ! makes you think it's a special operator, whereas it's just used as an extra character to overcome the problem with an empty string.
1 It's a variable. That particular example uses the directory option of a FOR loop, iterating through the directories and assigning them to %%A. That's also not a command-line example, but a batch file example. In batch files, you need to use %%A, while on the command-line, you'd just use %A.
We can replace strings in a batch file using the following command set str="jump over the chair" set str=%str:chair=table% These lines work fine and change the string "jump over the chair" to "jum...
You could do if defined var, which gives the benefit of working within if, for, and other parenthetical code blocks without requiring delayed expansion. There's also conditional execution based on zero or non-zero errorlevel.
In this context, it is used to perform substring modification of a variable using an offset from the first character in the variables content, as explained in the help output of Set /?.
