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This article mainly shows you "what are the common judgments of If commands in bat", which are easy to understand and clear, and hope to help you solve your doubts. Let me lead you to study and learn this article "what is the common judgment of If commands in bat?"

If command

If said it would determine whether the specified conditions were met and then decide to execute different orders.

There are three formats:

1), if "parameter" = = "string" command to be executed

If the parameter is equal to the specified string, the condition holds, run the command, otherwise run the next sentence. (note that there are two equal signs)

For example, if "% 1" = "a" format a:

If {% 1} = = {} goto noparms

If {% 2} = = {} goto noparms

2), if exist file name command to be executed

If there is a specified file, the condition is established, run the command, otherwise run the next sentence.

Such as if exist config.sys edit config.sys

3), if errorlevel / if not errorlevel digital commands to be executed

If the return code is equal to the specified number, the condition holds, run the command, otherwise run the next sentence.

Such as if errorlevel 2 goto x2

When the DOS program runs, it will return a number to DOS, which is called error code errorlevel or return code. The common return codes are 0,1.

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