File adapter operating system command exit code

Question

Hello,
If you call an operating system command in the file adapter, how is the exit code of the command handled? The documentation says nothing about this.
If I call 'true', I expect the file adapter to succeed.
If I call 'false', I expect the file adapter to fail.
Hope someone can calrify.
Best regards
/Otto Frost

Answer 1

Hi, Yes, you are rigth, it spawns a subprocess, that runs without control.
In java you use Runtime.exec().
It returns a process.
process.exitValue() returns an int.
The process is already used to terminate the process after timeout I suppose.
You would like to be able to have the fileadapter succeed or fail depending on this exitValue.
Depending on the command you execute, the exit code is different. RTFM on unix.
You would like to define which codes should be treated as success, and which ones that should be treated as failure.
true typically returns 0 and false not 0
However, a comparison command could for example return 0 for equal, -1 if the frist argument is smaller and 1 if the first argument is larger.
For the diff command, Exit status is 0 if inputs are the same, 1 if different, 2 if trouble.
Thanks
/Otto