external-process

How can I invoke an external shell script (Or alternatively an external PHP script) from PHP itself and get its process ID within the same script? $command = 'yourcommand' . ' > /dev/null 2>&1 & echo $!; '; $pid = exec($command, $output); var_dump($pid); Mark Amery If you want to do this strictly using tools PHP gives you, rather than Unix-specific wizardry , you can do so with proc_open and proc_get_status , although the need to pass a descriptor spec into proc_open makes it unpleasantly verbose to use: <?php $descriptorspec = [ 0 => ['pipe', 'r'], 1 => ['pipe', 'w'], 2 => ['pipe', 'w'] ];

I have C# winforms application that needs to start an external exe from time to time, but I do not wish to start another process if one is already running, but rather switch to it. So how in C# would I so this in the example below? using System.Diagnostics; ... Process foo = new Process(); foo.StartInfo.FileName = @"C:\bar\foo.exe"; foo.StartInfo.Arguments = "Username Password"; bool isRunning = //TODO: Check to see if process foo.exe is already running if (isRunning) { //TODO: Switch to foo.exe process } else { foo.Start(); } This should do it for ya. Check Processes //Namespaces we need to

How can I call an external program with a python script and retrieve the output and return code? jkp Look at the subprocess module: a simple example follows... from subprocess import Popen, PIPE process = Popen(["ls", "-la", "."], stdout=PIPE) (output, err) = process.communicate() exit_code = process.wait() Following Ambroz Bizjak's previous comment, here is a solution that worked for me: import shlex from subprocess import Popen, PIPE cmd = "..." process = Popen(shlex.split(cmd), stdout=PIPE) process.communicate() exit_code = process.wait() Check out the subprocess module here: http://docs