Cygwin bash using ProcessBuilder

Question

Hi,
i am trying to execute a command in a cygwin-bash.
the java code is:
import java.io.*;
public class cmd {
     public static void execute(String cmd_array[]) {
          execute(cmd_array, null);
     public static void execute(String cmd_array[], String work_directory) {
          try {
               ProcessBuilder pb = new ProcessBuilder(cmd_array);
               if(work_directory != null) {
                    pb.directory(new File(work_directory));
               Process process = pb.start();
               String line;
               System.out.println("Here is the standard output of the command:\n");
               BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
               while ((line = stdInput.readLine()) != null) {
                    System.out.println(line);
               System.out.println("Here is the error output of the command:\n");
               BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));
               while ((line = stdError.readLine()) != null) {
                    System.out.println(line);
               process.waitFor();
               System.out.println(process.exitValue());
          } catch(IOException e) {
               e.printStackTrace();
          } catch(InterruptedException e) {
               e.printStackTrace();
}the following is working:
String[] cmd_array = new String[2];
cmd_array[0] = "C:/Program Files/System/Cygwin/bin/bash.exe";
cmd_array[1] = "--version";
cmd.execute(cmd_array,"C:/Program Files/System/Cygwin/bin");this does not work:
String[] cmd_array = new String[3];
cmd_array[0] = "C:/Program Files/System/Cygwin/bin/bash.exe";
cmd_array[2] = "--login";
cmd_array[2] = "-c 'ls'";
cmd.execute(cmd_array,"C:/Program Files/System/Cygwin/bin");i get the following output:
Here is the standard output of the command:
Here is the error output of the command:
/usr/bin/bash: - : invalid option
Usage:  /usr/bin/bash [GNU long option] [option] ...
        /usr/bin/bash [GNU long option] [option] script-file ...
GNU long options:
        --debug
        --debugger
        --dump-po-strings
        --dump-strings
        --help
        --init-file
        --login
        --noediting
        --noprofile
        --norc
        --posix
        --protected
        --rcfile
        --restricted
        --verbose
        --version
        --wordexp
Shell options:
        -irsD or -c command or -O shopt_option          (invocation only)
        -abefhkmnptuvxBCHP or -o optionIt seems as if the argument --login is not passed correctly.
Thanks for any help.
Robert

Answer 1

Hi,
i am trying to execute a command in a cygwin-bash.
the java code is:
import java.io.*;
public class cmd {
     public static void execute(String cmd_array[]) {
          execute(cmd_array, null);
     public static void execute(String cmd_array[], String work_directory) {
          try {
               ProcessBuilder pb = new ProcessBuilder(cmd_array);
               if(work_directory != null) {
                    pb.directory(new File(work_directory));
               Process process = pb.start();
               String line;
               System.out.println("Here is the standard output of the command:\n");
               BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream()));
               while ((line = stdInput.readLine()) != null) {
                    System.out.println(line);
               System.out.println("Here is the error output of the command:\n");
               BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream()));
               while ((line = stdError.readLine()) != null) {
                    System.out.println(line);
               process.waitFor();
               System.out.println(process.exitValue());
          } catch(IOException e) {
               e.printStackTrace();
          } catch(InterruptedException e) {
               e.printStackTrace();
}the following is working:
String[] cmd_array = new String[2];
cmd_array[0] = "C:/Program Files/System/Cygwin/bin/bash.exe";
cmd_array[1] = "--version";
cmd.execute(cmd_array,"C:/Program Files/System/Cygwin/bin");this does not work:
String[] cmd_array = new String[3];
cmd_array[0] = "C:/Program Files/System/Cygwin/bin/bash.exe";
cmd_array[2] = "--login";
cmd_array[2] = "-c 'ls'";
cmd.execute(cmd_array,"C:/Program Files/System/Cygwin/bin");i get the following output:
Here is the standard output of the command:
Here is the error output of the command:
/usr/bin/bash: - : invalid option
Usage:  /usr/bin/bash [GNU long option] [option] ...
        /usr/bin/bash [GNU long option] [option] script-file ...
GNU long options:
        --debug
        --debugger
        --dump-po-strings
        --dump-strings
        --help
        --init-file
        --login
        --noediting
        --noprofile
        --norc
        --posix
        --protected
        --rcfile
        --restricted
        --verbose
        --version
        --wordexp
Shell options:
        -irsD or -c command or -O shopt_option          (invocation only)
        -abefhkmnptuvxBCHP or -o optionIt seems as if the argument --login is not passed correctly.
Thanks for any help.
Robert