How can I call a shell script from a Java program?

Question

I use ubuntu 10.04 with eclipse. I created a shell script, exam.sh:

#!/bin/bash 
echo "Hello World"

with chmod 755 exam.sh

On the command line, I can execute ./exam.sh // ok command showing me Hello World

I want to call this exam.sh with java code, this is my java code:

public static void main(String[] args) {    
Runtime r = Runtime.getRuntime();
Process p = null;
String cmd[] = {"/bin/bash","cd","/home/erdi/Desktop", ".","/","exam.sh"};

try {
    p = r.exec(cmd);
    System.out.println("testing...");//ok
} catch (Exception e) {
    e.printStackTrace();
}
}

This doesn't function, where did I make a mistake? Yes I know i can search by google but I didn't find an answer to my problem. It gives howTos and tutorials about this feature but I didn't find an answer.

The original post didn't have a newline between #!/bin/bash and echo "Hello World". Erci says the script worked from the command line, so I'm assuming that was just a formatting issue, and added the newline. — Jim Lewis
– Jim Lewis, Commented Jul 2, 2011 at 14:54

Ninja · Accepted Answer · 2020-11-25 10:04:25Z

5

Try this instead:

cmd[] = {"/bin/bash", "/home/ercan/Desktop/exam.sh"};

You can just invoke bash on the shell script directly. To run a command string (like cd) you would need to use the -c switch.

If you need the working directory of the script to be your Desktop, you can use another overload of Runtime.exec:

Process proc = Runtime.getRuntime().exec(cmd, new String[0], new File("/home/ercan/Desktop"));

Alternatively, the ProcessBuilder class makes executing processes a bit nicer.

edited Nov 25, 2020 at 10:04

Ninja

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answered Jul 2, 2011 at 14:37

Mark Peters

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4 Comments

erci di Over a year ago

Process proc = runtime.exec(cmd, new String[0], new File("/home/ercan/Desktop"));

Mark Peters Over a year ago

@erci: yes? Is there something about that line that isn't working?

erci di Over a year ago

The line with process proc.... Gives error " No suggation avaible" . İ think i need new Java code

Ninja Over a year ago

@ercidi I think it's Runtime.getRuntime()

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