Run Bash Command from JAVA on AWS EC2 Instance

Question

I am new to using AWS SDK on Java. I have created a program to create AWS instances from Java and to check if its running. But I am not able to figure out how to run a bash command on that running instance. Please help!

try
                {
                    String lscmd = "ls";
                    Process p=Runtime.getRuntime().exec(lscmd);
                    p.waitFor();
                    BufferedReader reader=new BufferedReader(new InputStreamReader(p.getInputStream()));
                    String line=reader.readLine();
                    while(line!=null)
                    {
                        System.out.println(line);
                        line=reader.readLine();
                    }
                }
                catch(IOException e1) {
                    e1.printStackTrace();
                }
                catch(InterruptedException e2) {
                    System.out.println("Pblm found2.");
                }

But I get an error saying,

java.io.IOException: Cannot run program "ls": CreateProcess error=2, The system cannot     find the file specified
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at ListInstances.main(ListInstances.java:79)

Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified at java.lang.ProcessImpl.create(Native Method) at java.lang.ProcessImpl.(Unknown Source) at java.lang.ProcessImpl.start(Unknown Source) ... 5 more

I am not sure how to connect to the instance I created and run this command on that instance.

One solution might be to ssh into it and then run the command using jsch? — pylua
– pylua, Commented Feb 8, 2014 at 19:35

David Levesque · Accepted Answer · 2014-02-08 20:34:43Z

2

Could it be that the PATH is not defined and it doesn't know where to find ls? Try with the full path (e.g. /bin/ls) to verify.

answered Feb 8, 2014 at 20:34

David Levesque

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