How can I execute unix sort command (/usr/bin/sort) from Java

How can I execute unix sort command (/usr/bin/sort) from Java

File inputFile = new File(inputFileName);

//build the command (optional number of sort columns)

List<String> command = new LinkedList<String>();

command.addAll(ImmutableList.<String>of("sort","-t"+delimiter));

for (int i : sortFieldPositions) {

    command.add("-k"+i+","+i);

}

command.addAll(ImmutableList.<String>of(inputFileName,">",outputFileName));

//for debugging: output the command that will be executed

System.out.println("Executing: "+Joiner.on(" ").join(command));

//construct and start the process

Process process = new ProcessBuilder(command).redirectErrorStream(true).directory(inputFile.getParentFile()).start();

//for debugging: save process output

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));

StringBuilder outputStringBuilder = new StringBuilder();

for (String line; (line = bufferedReader.readLine()) != null; /*reading taking place in check */) {

    System.out.println("FROM PROCESS: "+line);

    outputStringBuilder.append(line);

}

bufferedReader.close();

if (process.exitValue() != 0) {

    //something went wrong

    throw new RuntimeException("Error code "+process.exitValue()+" executing command: "+Joiner.on(" ").join(command)+"n"+outputStringBuilder.toString());

}

Executing: sort -t, -k2,2 -k1,1 /tmp/java/TestDataSorterImporterInput.txt /tmp/java/TestDataSorterImporterOutput.txt

FROM PROCESS: sort: stat failed: >: No such file or directory

String whatever = "filename";

Process p = Runtime.getRuntime().exec("sort -t -k2 2 -k1 1 " + whatever);