Checking errorlevel in a batch file

It is safer this way as many special characters have special meanings and will break more complex code without any warning and take hours to debug. I know, this trap has befallen me whenever I forget my own advice. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

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Where am I going wrong here? Daniel Powell Daniel Powell 7, 10 10 gold badges 58 58 silver badges bronze badges. Hmm, perhaps 1 is wrong? If the variable userprofile does not exist, then nothing will be displayed in the console output. In the decision making chapter, we have seen statements which have been executed one after the other in a sequential manner. They are then classified into flow of control statements.

There is no direct while statement available in Batch Script but we can do an implementation of this loop very easily by using the if statement and labels. The "FOR" construct offers looping capabilities for batch files. Following is the general form of the statement. The above command will produce the following output if the batch file passes the command line arguments of 1,2 and 3 as Test.

The break statement is used to alter the flow of control inside loops within any programming language. I also recommend documenting your possible return codes with easy to read SET statements at the top of your script file, like this:.

Note that I break my own convention here and use uppercase variable names — I do this to denote that the variable is constant and should not be modified elsewhere.

This gives me the flexibility to bitwise OR multiple error numbers together if I want to record numerous problems in one error code. If both SomeCommand. This return code tells me that both errors were raised.

A successful script execution returns a 0 while an unsuccessful one returns a non-zero value that is interpreted as an Error Code or an errorlevel. In the batch file , it is always a good practice to use environment variables instead of constant values. Since the same variable get expanded to different values on different computers.