Linux terminal command in Java does not work

Question

I'm trying to execute a linux command in my java code. It needs to change permissions for some directory.

Here is my attempt:

String  Cmd = "echo myPassword | sudo -S chmod 777 -R /home/somePath";
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(Cmd);

The command held in String Cmd is working perfectly when I used it in terminal. But when I use it in my code nothing happens. There is no error or warning feedback that helps me to understand my mistake. What might be the problem?

Community · Accepted Answer · 2017-05-23 11:50:54Z

5

Java will not magically select bash as your executable. You probably want to do something like

"bash -c <your command>"

See this question:

How to run unix / shell commands with wildcards using Java?

(Also the | is a bash-thing. Java won't magically create pipes between processes.)

edited May 23, 2017 at 11:50

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answered Nov 25, 2014 at 15:13

aioobe

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2 Comments

zegkljan Over a year ago

Maybe you should mention that the | thing is part of the bash language and therefore it needs to be interpreted by bash (or similar shell).

şirket için Over a year ago

Process proc = new ProcessBuilder("/bin/bash", "-c", "echo myPassword | sudo -S chmod 777 -R /home/somePath").start();

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