How to pass arguments to a shell script using java?

Question

I have written a code which calls a shell script:

 ProcessBuilder pb2=new ProcessBuilder("/home/abhijeet/sample1.sh");
 Process script_exec = pb2.start();
 pb2.redirectError();

Code works for me , as it executes script.

This script takes two arguements 1: input file 2: seqs , in a pattern like:

 sample1.sh -ip=abc.txt --seqs=20

Shell script is interactive one, which asks for many parameters , so i have changed it's code and i will pass those values as arguements to it. So complete format should be like:

db=abc outformat=1 threads=10 sample1.sh --ip=abc.txt --seqs=20

So how can i execute this script using java? Is there any other way to call a interactive script using java?

agad · Accepted Answer · 2014-06-27 12:11:00Z

1

You can try this:

 ProcessBuilder pb2=new ProcessBuilder("/home/abhijeet/sample1.sh --ip=abc.txt --seqs=20");
 Process script_exec = pb2.start();
 OutputStream in = script_exec.getOutputStream();
 in.write("abc".getBytes());
 in.write("1".getBytes());
 in.write("10".getBytes());
 in.flush();
 in.close();

This code writes abc, 1 and 10 to process input.

edited Jun 27, 2014 at 12:11

answered Jun 27, 2014 at 12:02

agad

2,1891 gold badge20 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Abhijeet Panwar Over a year ago

Is this code for interactive script ? I thought that might be difficult so I have modified script and i want to directly set those values as argument.

agad Over a year ago

When you call interactive program, it waits for user input. in.write("abc".getBytes()); in.write("1".getBytes()); in.write("10".getBytes()); writes the values as an user would do it.

Abhijeet Panwar Over a year ago

db output and threds are passed by this but --ip and --seqs still not working .Should i change my script and take those values also as these arguements?

agad Over a year ago

As I understand --ip and --seqs are not user inputs, but program parameters. In such case you need to add them to the command or pass as arguments like fmcato wrote.

Abhijeet Panwar Over a year ago

Stuck at point that if that interactive script is a long one, and it takes input somewhere in between then how can i know using inputstream that script is prompting for user input?

user784540 · Accepted Answer · 2014-06-27 11:31:40Z

1

I recommend to use Apache Commons Exec, it helps to run external processes in multi-platform environment.

Here is the tutorial: http://commons.apache.org/proper/commons-exec/tutorial.html

answered Jun 27, 2014 at 11:31

user784540

Comments

fmcato · Accepted Answer · 2014-06-27 11:38:29Z

1

Just pass the arguments in the ProcessBuilder constructor. Like this:

ProcessBuilder pb2=new ProcessBuilder("/home/abhijeet/sample1.sh", "-ip=abc.txt", "--seqs=20");

You can also use a List < String > instead.

answered Jun 27, 2014 at 11:38

fmcato

1721 silver badge12 bronze badges

Collectives™ on Stack Overflow

How to pass arguments to a shell script using java?

3 Answers 3

5 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

5 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related