According to PHP’s exec quickref, you can pass pointers in to get the output and status of the command. <?php exec(‘C://abc//wkhtmltopdf home.html sample.pdf’, $output, $return); // Return will return non-zero upon an error if (!$return) { echo “PDF Created Successfully”; } else { echo “PDF not created”; } ?> If you want to enumerate the … Read more
The following code will capture both the normal output (from StdOut) and the error output (from SdtErr). exec(‘ln -s ‘ . PLUGIN_DIR . ‘/.htaccess ‘ . ABSPATH . ‘/.htaccess 2>&1’,$output); var_dump($output);
I already said that I was new to exec() function. After doing some more digging, I came upon 2>&1 which needs to be added at the end of command in exec(). Thanks @mattosmat for pointing it out in the comments too. I did not try this at once because you said it is a Linux … Read more
There is a big difference between exec in Python 2 and exec() in Python 3. You are treating exec as a function, but it really is a statement in Python 2. Because of this difference, you cannot change local variables in function scope in Python 3 using exec, even though it was possible in Python … Read more
What you are looking for is the process pool class in multiprocessing. import multiprocessing import subprocess def work(cmd): return subprocess.call(cmd, shell=False) if __name__ == ‘__main__’: count = multiprocessing.cpu_count() pool = multiprocessing.Pool(processes=count) print pool.map(work, [‘ls’] * count) And here is a calculation example to make it easier to understand. The following will divide 10000 tasks on … Read more
You need to capture the stderr too. Redirecting stderr to stdout should do the trick. Append 2>&1 to the end of your command. e.g. exec(“/usr/bin/svn –username something –password something –non-interactive log -r HEAD –xml –verbose http://a51.unfuddle.com/svn/a51_activecollab/ 2>&1”, $output); If it is a complex command (e.g. one with a pipe, like doing a mysqldump and passing … Read more
There is no exec system call — this is usually used to refer to all the execXX calls as a group. They all do essentially the same thing: loading a new program into the current process, and provide it with arguments and environment variables. The differences are in how the program is found, how the … Read more
You’re almost there. You’re trying to modify a global variable so you have to add the global statement: old_string = “didn’t work” new_string = “worked” def function(): exec(“global old_string; old_string = new_string”) print(old_string) function() If you run the following version, you’ll see what happened in your version: old_string = “didn’t work” new_string = “worked” def … Read more
Since Python 3.4 there is a solution is the stdlib: https://docs.python.org/3/library/contextlib.html#contextlib.redirect_stdout from io import StringIO from contextlib import redirect_stdout f = StringIO() with redirect_stdout(f): help(pow) s = f.getvalue() In older versions you can write a context manager to handle replacing stdout: import sys from io import StringIO import contextlib @contextlib.contextmanager def stdoutIO(stdout=None): old = sys.stdout … Read more
Yes, you need to have the assignment within the exec statement: >>> def foo(): … return 5 … >>> exec(“a = foo()”) >>> a 5 This probably isn’t relevant for your case since its being used in controlled testing, but be careful with using exec with user defined input.