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If not exist c:\corpfiles\nul mkdir c:\corpfilesĮcho Unable to access network share \\bali\corpfiles A batch file can take advantage of this as off For example, the net use command returns 0 if it is able to map a drive letter to a shared folder, and it will return a nonzero number if it can't. Will execute the command if the previous program's exit status value is the listed number or higher. How? Through the errorlevel variation of the if command.Īfter running a command in a batch file, an if statement of the form The documentation for some programs may list specific error values and give their interpretations, which means that your batch files can use these values to take appropriate action. There is no predetermined meaning for any specific values. An exit status of zero means no problems larger numbers indicate trouble.
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This is a number that the program uses to indicate whether it thinks it did its job successfully.
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When a command line or even a Windows program exits, it leaves behind a number called its exit status or error status value. To see whether the folder c:\foldername exists. However, the special file nul appears to exist in every folder. The exist test only checks for files, not folders. The not modifier can be used with exist as well. If the filename has spaces in it, you'll need to surround it with quotes.
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Of course, you can specify a full path for the filename if that's appropriate, and you can use environment variables and % arguments to construct the name. The exist option lets you determine whether a particular file exists in the current directory: The if command also lets you reverse the sense of the test with the not option: If they are different or blank, you'll still have a valid command. If the items being tested are identical, they will still be identical when surrounded by the extra characters. Therefore, it's a common practice to surround the items to be tested with some character-any character. CMD expects to see something before the = part of the command and will bark if it doesn't. However, if the batch file is started with no arguments, then %1 would be replaced with nothing, and the command would turn into this: The command will still work as long as some command-line argument is given when the batch file is run. If they are omitted and the command is written as The quotation marks in this command aren't absolutely required.
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If and only if the batch file's first argument is the word ERASE, this command will delete the file somefile.dat. This is used in combination with command-line variable or environment variable substitution, as in this example: In its most basic form, if compares two strings and executes a command if the strings are equivalent: For this purpose, the batch file language has the if command. One of the most important capabilities of any programming language is the ability to choose from among different instructions based on conditions the program finds as it runs. Learn More Buy Conditional Processing with If Windows XP Under the Hood: Hardcore Windows Scripting and Command Line Power