Execute shell script multiple commands in one line using Process Builder in Java (Unix)

Question

I have a shell script that I would like to execute from java.

sudo su - username -c "ssh -t remote_hostname df -k"

This shell script works fine when you ran from the command prompt. However when I used process builder it will not return anything. If I do the following: sudo su - username -c ssh -t remote_hostname;df -k

then the command is running on my local machine not on the remote machine.

Appreciated any feedback.

java code

Process p;

ExecutorService es = null;
try {

p = Runtime.getRuntime().exec(test1.sh);

StreamGobbler sg = new StreamGobbler(p.getInputStream(), System.out::println());

es = Executors.newSingleThreadExecutor();

es.submt(sg);

int exitCode = p.waitfor();

assert exitCode == 0;

es.shutdown();


} catch (....) {
}

Can you show your code? May be worth noting, if you run from eclipse your shell environment won't usually be set — boot-and-bonnet
– boot-and-bonnet, Commented Nov 22, 2019 at 23:48
What machine? Your ssh command doesn't include one, are you sure that command runs from the prompt? — Elliott Frisch
– Elliott Frisch, Commented Nov 23, 2019 at 0:31
The shel script tst1.sh contains sudo su - username -c "ssh -t remote_hostname df -k" — Lucia Sugianto
– Lucia Sugianto, Commented Nov 25, 2019 at 20:39

dave_thompson_085 · Accepted Answer · 2019-11-25 21:41:09Z

1

Runtime.exec(String) is not a shell, and in particular doesn't parse and handle quotes like a shell. Dupe:
Why does Runtime.exec(String) work for some but not all commands?
Whitespace in bash path with java
Keytool command does not work when invoked with Java

Do something like

String[] cmd = { "sudo", "su", "-", "username", "-c", "ssh -t remote_hostname df -k" };
// note the last element is a single Java String that does not _contain_ 
// any quote characters (which would be backslashed in Java source)
... Runtime.getRuntime().exec(cmd) ...

Also, you shouldn't need -t when remoting df -k -- it doesn't do any special output handling. (Although it doesn't hurt, and is nearly free.)

answered Nov 25, 2019 at 21:41

dave_thompson_085

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2 Comments

Lucia Sugianto Over a year ago

Thank you so much, the above solution works. I appreciated very much for the answer as I have spent a week trying to figure out why it will not work in Java.

Roberto Manfreda Over a year ago

Yes Dave you are right... I removed my response because was a totally wrong content... Anyway this topic moved some interest in me so i started writing some code... I think that this side of java can be improved writing some good library! Tonight I started writing a library to execute entire scripts from java code using the exec() method. If you are interested contributing here's the github link github.com/robertomanfreda/java_bash_executor . The workaround i used is: read a file line after line, encode the content in base64 and execute the encoded content on /bin/bash using base64 :)

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