Call Shell Script From java

[vaskarbasak]

Hi All,

i want to run shell script from java.shell script run successfully and generate a file.
But when i want to check the existence of that file,it shows that the file is not present.

please help me to check the file from java or how could i know the proccess(Shell script) is finished.

i have given my code below.

package com;

import java.io.*;
import java.util.*;


public class ScriptBuilder {
public ScriptBuilder() {
}

public void writeScript() throws java.io.IOException {
Runtime rt = Runtime.getRuntime();
rt.exec("chmod 777 testinglinux.sh");
Process p = rt.exec("./testinglinux.sh");
try {
p.waitFor();
} catch (Exception e) {
e.printStackTrace();
}
String shellfilename = "testing.txt";
if (new File(shellfilename).exists()) {
System.out.println(shellfilename+" File exists");
}
}

public static void main(String[] args) throws java.io.IOException {
ScriptBuilder sb = new ScriptBuilder();
sb.writeScript();
}
}

Thanks!
Vaskar

[r035198x]

Hi All,

i want to run shell script from java.shell script run successfully and generate a file.
But when i want to check the existence of that file,it shows that the file is not present.

please help me to check the file from java or how could i know the proccess(Shell script) is finished.

i have given my code below.

package com;

import java.io.*;
import java.util.*;


public class ScriptBuilder {
public ScriptBuilder() {
}

public void writeScript() throws java.io.IOException {
Runtime rt = Runtime.getRuntime();
rt.exec("chmod 777 testinglinux.sh");
Process p = rt.exec("./testinglinux.sh");
try {
p.waitFor();
} catch (Exception e) {
e.printStackTrace();
}
String shellfilename = "testing.txt";
if (new File(shellfilename).exists()) {
System.out.println(shellfilename+" File exists");
}
}

public static void main(String[] args) throws java.io.IOException {
ScriptBuilder sb = new ScriptBuilder();
sb.writeScript();
}
}

Thanks!
Vaskar

There is a File.exists() method. Will that do for you?

[r035198x]

Having looked over your question again, I realize now that my response is meaningless.

What you need is this article which explains the traps one runs into when using Runtime.exec.

[satch]

Hi All,

i want to run shell script from java.shell script run successfully and generate a file.
But when i want to check the existence of that file,it shows that the file is not present.

please help me to check the file from java or how could i know the proccess(Shell script) is finished.

i have given my code below.

package com;
 
import java.io.*;
import java.util.*;
 
 
public class ScriptBuilder {
public ScriptBuilder() {
}
 
public void writeScript() throws java.io.IOException {
Runtime rt = Runtime.getRuntime();
rt.exec("chmod 777 testinglinux.sh");
Process p = rt.exec("./testinglinux.sh");
try {
p.waitFor();
} catch (Exception e) {
e.printStackTrace();
}
String shellfilename = "testing.txt";
if (new File(shellfilename).exists()) {
System.out.println(shellfilename+" File exists");
}
}
 
public static void main(String[] args) throws java.io.IOException {
ScriptBuilder sb = new ScriptBuilder();
sb.writeScript();
}
}
 

Thanks!
Vaskar

As I am in windows environment, I tried your program by changing the shell scrip to a batch file and it worked fine. I dont know any reason why it should fail for you.
To check the return status of the process use the exitValue method. A successful completion would return 0 exit value.