How to run a .sh file from Java?

Question

I need to run a .sh file from my Java code with out passing any arguments. I already tried doing it with

Runtime.getRuntime().exec("src/lexparser.sh");

and

ProcessBuilder pb = new ProcessBuilder("src/lexparser.sh");
Process p = pb.start();

Both of the above methods didn't work. Is there any other method to run a .sh file form Java?

See related question http://stackoverflow.com/questions/525212/how-to-run-unix-shell-script-from-java-code — Mihai8, Mar 15 '13 at 09:14
@user2111009 Check that you are not missing shell environment vars at runtime.You may need to manipulate processBuilder.environment() for that — user18428, Mar 15 '13 at 09:24
you are passing just String as argument in exec method, exec method except String[] argument. see my answer below, i have transerfred file successfuly — Girdhar Singh Rathore, May 19 '16 at 14:55
http://stackoverflow.com/questions/525212/how-to-run-unix-shell-script-from-java-code/37327025#37327025 — Girdhar Singh Rathore, May 19 '16 at 15:00

Biswajit · Accepted Answer · 2013-03-15T09:19:54.880

12

ProcessBuilder pb = new ProcessBuilder("src/lexparser.sh", "myArg1", "myArg2");
 Process p = pb.start();
 BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
 String line = null;
 while ((line = reader.readLine()) != null)
 {
    System.out.println(line);
 }

edited Mar 15 '13 at 09:19

answered Mar 15 '13 at 09:10

Biswajit

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where are u using `Process p;` ? – AmitG Mar 15 '13 at 09:12
to start processbuilder – Biswajit Mar 15 '13 at 09:14
I mean where are u using `p` reference variable in later code? – AmitG Mar 15 '13 at 09:16
1

I have changed the code .plz check – Biswajit Mar 15 '13 at 09:20
OK. I got your corrections. – AmitG Mar 15 '13 at 09:21
@Biswajit Can we execute a .sh file without providing arguements?? – Lucy Oct 20 '14 at 14:28

score 3 · Answer 2 · answered Mar 15 '13 at 09:20

3

There are two things that are easy to miss:

Path and CWD. The simplest way to ensure that the executable is found is to provide the absolute path to it, for example /usr/local/bin/lexparser.sh
Process output. You need to read the process output. The output is buffered and if the output buffer gets full the spawned process will hang.

answered Mar 15 '13 at 09:20

Klas Lindbäck

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I kept the .sh file in my project folder. My .sh file should read a file and update the contents of another file. It's working file when am running it directly from terminal but not from a java file – yAsH Mar 15 '13 at 09:25
+1 for the Path issue. I believe that there's an exec() method that can take in the working directory as the last argument (and I think you can null out the rest if n/a) – SeKa Mar 15 '13 at 09:28
@user2111009 I haven't spawned processes from Java in a long time, so I cannot give any more specific information than what I've already provided. Try setting the CWD explicitly from inside the script (using `cd`). – Klas Lindbäck Mar 15 '13 at 10:10

How to run a .sh file from Java?

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