i am trying to run a batch file from my java code
this is the batch file line :
C:\Users\abdelk\workspace\Symmetrix>symconfigure -sid 13 -cmd "create dev count=16, size=139840, emulation=FBA , config=TDEV;" commit -nop >> out_file.txt
when i run the batch file from my code, "1" randomly appears before the ">>". so line in cmd becomes like that :
C:\Users\abdelk\workspace\Symmetrix>symconfigure -sid 13 -cmd "create dev count=16, size=139840, emulation=FBA , config=TDEV;" commit -nop **1>>** outfile.txt
I don't know how can i remove this random appearing "1"
this is how i run the batch file from my code
rt.exec("cmd.exe /c start "+functions_object.edit_host_name(current_host_name)+"_Meta.bat",null,new File("C:\\Users\\abdelk\\workspace\\Project"));
First, take a look on Microsoft's TechNet article using command redirection operators.
Numeric 1 is an equivalent for handle stdout (standard output).
In batch files numeric 1 is omitted on redirection stdout.
For example put those 2 lines into a batch file and run it
echo This is just a redirect test.>CapturedStandardOutput.txt
@pause
You will see that cmd.exe automatically inserts 1 (space and 1) left to the redirection operator >.
In general it is not advisable to add already in batch file 1 for stdout.
Why?
Look what is executed with:
echo This is just a redirect test.1>CapturedStandardOutput.txt
@pause
You see in console window:
echo This is just a redirect test.1 1>CapturedStandardOutput.txt
And the file CapturedStandardOutput.txt contains the line:
This is just a redirect test.1
The solution is to use in batch file:
echo This is just a redirect test. 1>CapturedStandardOutput.txt
This results in execution of the line:
echo This is just a redirect test. 1>CapturedStandardOutput.txt
And there is now the line below in file CapturedStandardOutput.txt:
This is just a redirect test.
What you can't see here in the browser window is that the line in the text file ends now with a trailing space in comparison to first example. Therefore best is to use > and >> always without 1 as otherwise it is not really simple to control what is written to the text file.
One more hint:
To redirect a text to a file which ends with 1, 2, ..., 9 it is necessary to escape the number with ^.
Execution of a batch file with
echo Number is ^1>CapturedStandardOutput.txt
@pause
results in executing the command line
echo Number is 1 1>CapturedStandardOutput.txt
and in file CapturedStandardOutput.txt the line
Number is 1
with no trailing space at end of the line.
0 left to > and >> must not be escaped to get number 0 written into a text file.
