diff output of two python programs in windows cmd

Question

So I am trying to compare output of two python programs, which have files that I will call trace1.py and trace2.py. Currently I am using process substitution with diff to try and compare their outputs, however I'm having trouble with finding both files, since they are in separate sub-directories of my current directory:

diff <(python /subdir1/tracing1.py) <(python /subdir2/tracing2.py)

When I run this, I get

The system cannot find the file specified.

I think I'm messing up some sort of path formatting, or else I'm using the process substitution incorrectly.

EDIT: In the end I decided that I didn't need to use process substitution, and instead could just diff program output after each program is run. However thanks to Fallenreaper in the comments, I was able to find a single command that does what I initially wanted:

python subdir1/tracing1.py > outfile1.txt & python subdir2/tracing2.py > outfile2.txt & diff outfile1.txt outfile2.txt

Can you paste the exact command that you are running? What is your directory struc like? — Bayko
– Bayko, Commented Jun 29, 2018 at 20:24
Maybe something like: python /path/tracing1.py &1> outfile1.txt & python /path/tracing2.py &1 >outfile2.txt & diff outfile1.txt outfile2.txt — Fallenreaper
– Fallenreaper, Commented Jun 29, 2018 at 20:24
If subdir1 and subdir2 are subdirectories of the current directory (and not root-level directories), you probably mean subdir1/tracing1.py (without the leading slash). — glibdud
– glibdud, Commented Jun 29, 2018 at 20:28
@Fallenreaper Process substitution captures both output to stdout and stderr, see for example diff <(echo blah >&2) <(echo blahx), so I don't think that's the problem. — Benjamin W.
– Benjamin W., Commented Jun 29, 2018 at 20:28
Honestly come to think of it, I don't even need to run both programs one after another. So really I can just redirect output to two separate files and then diff after. I guess I was over complicating things in the end. I guess my curiosity with the error made me want to ask. — Jack Bates
– Jack Bates, Commented Jun 29, 2018 at 20:33

Madoo · Accepted Answer · 2018-06-29 20:42:58Z

1

Sorry, not enough rep to comment yet :( Your line works perfectly when you remove that slash. I would suggest using absolute path names or a relative path from current directory cos that front slash would take you to your root directory.

Cheers.

answered Jun 29, 2018 at 20:42

Madoo

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