Running Command Line in Java

Running Command Line in Java

Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("java -jar map.jar time.rel test.txt debug");

http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html

Run cmd commands through Java

One way to run a process from a different directory to the working directory of your Java program is to change directory and then run the process in the same command line. You can do this by getting cmd.exe to run a command line such as cd some_directory && some_program.

The following example changes to a different directory and runs dir from there. Admittedly, I could just dir that directory without needing to cd to it, but this is only an example:

import java.io.*;

public class CmdTest {
    public static void main(String[] args) throws Exception {
        ProcessBuilder builder = new ProcessBuilder(
            "cmd.exe", "/c", "cd \"C:\\Program Files\\Microsoft SQL Server\" && dir");
        builder.redirectErrorStream(true);
        Process p = builder.start();
        BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line;
        while (true) {
            line = r.readLine();
            if (line == null) { break; }
            System.out.println(line);
        }
    }
}

Note also that I'm using a ProcessBuilder to run the command. Amongst other things, this allows me to redirect the process's standard error into its standard output, by calling redirectErrorStream(true). Doing so gives me only one stream to read from.

This gives me the following output on my machine:

C:\Users\Luke\StackOverflow>java CmdTest
 Volume in drive C is Windows7
 Volume Serial Number is D8F0-C934

 Directory of C:\Program Files\Microsoft SQL Server

29/07/2011  11:03    <DIR>          .
29/07/2011  11:03    <DIR>          ..
21/01/2011  20:37    <DIR>          100
21/01/2011  20:35    <DIR>          80
21/01/2011  20:35    <DIR>          90
21/01/2011  20:39    <DIR>          MSSQL10_50.SQLEXPRESS
               0 File(s)              0 bytes
               6 Dir(s)  209,496,424,448 bytes free

How do I run a Java program from the command line on Windows?

Source: javaindos.

Let's say your file is in C:\mywork\

Run Command Prompt

C:\> cd \mywork

This makes C:\mywork the current directory.

C:\mywork> dir

This displays the directory contents. You should see
filenamehere.java among the files.

C:\mywork> set path=%path%;C:\Program Files\Java\jdk1.5.0_09\bin

This tells the system where to find JDK programs.

C:\mywork> javac filenamehere.java

This runs javac.exe, the compiler. You should see nothing but the
next system prompt...

C:\mywork> dir

javac has created the filenamehere.class file. You should see
filenamehere.java and filenamehere.class among the files.

C:\mywork> java filenamehere

This runs the Java interpreter. You should then see your program
output.

If the system cannot find javac, check the set path command. If javac
runs but you get errors, check your Java text. If the program
compiles but you get an exception, check the spelling and
capitalization in the file name and the class name and the java
HelloWorld command. Java is case-sensitive!

Running a command-line operation from within Java

The "move" command is part of the cmd.exe interpreter, and not a executable by itself.

This would work:

cmd.exe /c move file1 file2 

How to execute cmd commands through java

You can try below code

 Process process  = Runtime.getRuntime().exec("cmd /c start cmd.exe /K java -jar selenium-server-standalone-2.44.0.jar -role hub");

However this will run executable jar from your current directory, where you .class file exist.

how can I execute java command by java code?

Your problem may be a difference between PATH of the current running VM, compared the shell (bash etc) you use and implicit passing of CLASSPATH. Check the location of java which which java in the shell that works and try using in your exec.

Also you won't see all issues when running as you don't access the error stream at same time as the output stream, changing to ProcessBuilder allows easier debugging as you can redirect the out/err streams to a file. But if JADE runs for a long time or produces a lot of output you should consumer STDOUT+ERR in background threads.

Try this in jshell:

String[] cmd = new String[]{"java", "jade.Boot", "-gui"};
ProcessBuilder pb = new ProcessBuilder(cmd); 
File fileOut = new File("stdout.log"); 
File fileErr = new File("stderr.log"); 
pb.redirectError(fileErr); 
pb.redirectOutput(fileOut); 
Process p = pb.start(); 
int rc = p.waitFor();
String stdout = Files.readString(fileOut.toPath());
String stderr = Files.readString(fileErr.toPath());

System.out.println("Exit   : "+rc +' '+(rc == 0 ? "OK":"**** ERROR ****"));
System.out.println("STDOUT : "+stdout);
System.out.println("STDERR : "+stderr);

How to open the command prompt and insert commands using Java?

I know that people recommend staying away from rt.exec(String), but this works, and I don't know how to change it into the array version.

rt.exec("cmd.exe /c cd \""+new_dir+"\" & start cmd.exe /k \"java -flag -flag -cp terminal-based-program.jar\"");

How do I run command line from Java code in the background?

Removing the 'start' completely will do what you want (as this is what is creating the window):

Process process = Runtime.getRuntime().exec("cmd /c rake.bat");

I have tested this and it works, ofcourse if you want to communicate with the command prompt you'd have to have Input and Output streams, also not forgetting your Error stream
As stated in the comment though removing 'start' on XP wont help (as it wont work).

Running Java module from command line breaks when I reverse argument order

Official documentation:

To launch the main class in a module:
java [options] -m module[/mainclass] [args...]

-p is an option that must come before -m

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