Execute batch file with args in java

Question

I am trying to run batch file using java command. I have following code

Runtime.getRuntime().exec("cmd /c start C:\\temp\\Sept_2016\\22Sept\\filecompare.bat");

I have batch file named filecompare.bat as below

fc "C:\temp\Sept_2016\22Sept\MSP_Files\msp.txt" "C:\temp\Sept_2016\22Sept\MIB_Files\mib.txt">>"C:\temp\Sept_2016\22Sept\mismatch.txt"

This works as per expected and output gets stored in txt file.

Now I don't want to use hard coded values as above I want to get the values from Java program. So I am writing java code as below

String file1 = new String("C:\\temp\\Sept_2016\\22Sept\\MSP_Files\\msp.txt");
String file2 = new String("C:\\temp\\Sept_2016\\22Sept\\MIB_Files\\mib.txt");
String file3 = new String("C:\\temp\\Sept_2016\\22Sept\\mismatch.txt");
Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c", "start C:\\temp\\Sept_2016\\22Sept\\filecompare.bat", file1, file2, file3});

On the similar lines I am modifying batch file as

fc %4 %5>>%6

But this does not seem to be working. It is just opening dos window.

Could you please help me achieve this? Thanks in advance

You passing only 3 parameters why you use %4, %5 and %6? — talex
– talex, Commented Sep 23, 2016 at 12:55
I am passing 5 parameters as below 1) "cmd.exe", 2) "/c", 3) "start C:\\temp\\Sept_2016\\22Sept\\filecompare.bat", 4) file1, 5) file2, 6) file3 — Sachin
– Sachin, Commented Sep 23, 2016 at 12:57
I belive that first three elements of your String[] should be concatenated. And by the way, why can't you just concatanate all the string and just pass a single String? — freefall
– freefall, Commented Sep 23, 2016 at 12:57
You have combined two parameters which can cause problems: start and C:\\temp\\Sept_2016\\22Sept\\filecompare.bat. Anyway start is not needed you can remove it. — Robert
– Robert, Commented Sep 23, 2016 at 12:58
@Sachin Yes. You passing 5 parameters to cmd but when it invokes filecompare.bat it pass only 3 parameters there. filecompare.bat know nothing about those 5 parameters. It knows only about parameters that was passed to it. — talex
– talex, Commented Sep 23, 2016 at 13:00

talex · Accepted Answer · 2016-09-23 13:01:24Z

1

Replace fc %4 %5>>%6 with fc %1 %2>>%3.

filecompare.bat being executed only aware of its own parameter, not parameters you pass to cmd.

answered Sep 23, 2016 at 13:01

talex

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6 Comments

Sachin Over a year ago

Hey Talex, thanks man. Thanks a lot. It is working now. The only problem I can see now is that it is opening 2 command prompts. Any thought on that?

talex Over a year ago

As it was suggested remove start from parameters.

Sachin Over a year ago

Removed start but then it is opening a single command prompt but it is not processing my command, it simply opens single command prompt

talex Over a year ago

Post it as another question.

Sachin Over a year ago

My problem got solved. Actually there was another pience of code which was opening another command prompt. I removed that code and now it is working as expected. Just one note to all guys. Start is needed to open up command prompt If I remove start then it does not open the command prompt.

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