How Can I Execute Complex Linux Commands with Redirections and Pipes from Java?

Executing Linux Commands with Redirections and Pipes in Java

Invoking Linux shell commands from Java can be cumbersome when dealing with redirections and pipes. The default Runtime.exec() method is limited in handling these constructs.

To overcome this limitation, modify the exec() call to specify the shell interpreter explicitly and pass the command as an argument:

String[] command = {"csh", "-c", "shell command"};
Process p = Runtime.getRuntime().exec(command);

In this example, "csh" is invoked as the shell interpreter, and "shell command" is treated as an argument to the shell. This syntax supports redirections and pipes, allowing you to execute complex commands like:

Process p = Runtime.getRuntime().exec(new String[]{"bash", "-c", "cat file.txt | grep 'pattern'"});

Keep in mind that the availability of shell interpreters like "csh" or "bash" may vary depending on your system. If you encounter any issues, try using an available interpreter instead.

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