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The following doesn’t work in Java (an exception is thrown):
Runtime.getRuntime().exec("cd mydir; myprog");
The same works fine in PHP:
exec("cd mydir; myprog");
What exactly is different in Java’s implementation and why (it seems more limited at first glance)?
the java exec command does not use the system command interpreter. something like “cd mydir; myprog” depends on the system command line interpreter (e.g. on windows
cmd, on linuxsh) to split that into 2 separate commands and execute each of them. java does not invoke the system command interpreter, so that does not work. you either need to call each command separately, or invoke the desired interpreter yourself as part of the command line.