Running a shell script using process builder in java

Running a shell script using process builder in java

Running shell script using process builder java: Linux shell scripts or windows bat scripts will called using Java with below approaches. Always use ProcessBuilder as recommended approach:

• Using Runtime.exec() 
  • Java code to execute shell script :

  •  StringBuilder builder = new StringBuilder();
     Process process = Runtime.getRuntime().exec("ps -ef");
     try {
     process.wait();
     } catch (InterruptedException e) {
           e.printStackTrace();
     }
     BufferedReader pReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
     String data = null;
     while((data=pReader.readLine())!=null){
          builder.append(line);
     }
     String result = builder.toString();
     System.out.print(result);

• Using Process Builder
  • Java Code to execute shell script using ProcessBuilder

 String cmd = "/home/javasavvy/sample_script.sh";  
//String cmd = "D://script.bat" //for windows
 ProcessBuilder pb = new ProcessBuilder(cmd); 
 try
 {
 Process process = pb.start();
 BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
 StringBuilder builder = new StringBuilder();
 String line = null;
 while ( (line = reader.readLine()) != null) {
 builder.append(line);
 }
 String result = builder.toString();
 System.out.print(result);
 System.out.println("end of script execution");
 }
 catch (IOException e)
 { System.out.print("error");
 e.printStackTrace();
 }

How to pass arguments to shellscript using java?

suppose you want to execute a shell script with attributes like admin,password,url like show in below :

    /home/jay/sam_script.sh  admin passwod 127.0.0.1

you can pass whole shell commnad as String array like show below:

Java code to launch shell script with arguments using Java ProcessBuilder:

String cmd= " /home/jay/sam_script.sh  admin passwod 127.0.0.1" ;
ProcessBuilder pb = new ProcessBuilder(cmd.split(" ")); 
Process pr = pb.start();

Hope this helps.