从Java程序运行linux命令txl

Question

I know we can run a linux terminal command in a java program like following code shows a "ls" command for the home directory.

String[] cmd1 =  {
        "/bin/sh",
        "-c",
        "cd ../.. && ls"};
        Process child1 = Runtime.getRuntime().exec(cmd1);
        child1.waitFor();

final BufferedReader is = new BufferedReader(new InputStreamReader(child1.getInputStream()));
        String line;
        while ((line = is.readLine()) != null) {

            System.out.println("output is: "+line);
        }

But I have no idea what "/bin/sh" and "-c" mean for? I searched it online and somebody used "bash" or else. And if I run the command as "cd ../.. && ls" only, I will get the same result.

So if there is a command in terminal as "txl -o output inputFile", where "txl" is a tool installed, how to write in in java? I tried

String[] cmd1 =  {
        "/bin/sh",
        "-c",
        "cd ../.. && txl -o output inputFile"};

But could not get the result. I add "cd ../.." to go to the home directory first from the working space because txl is installed in the home bin directory.

Can anyone give me some suggestions?

EDIT:

I made a stupid spelling error and the command in this format works!

Answer 1

you can find here what every parameter in ls do:

-c
 with -lt: sort by, and show, ctime (time of last modification of file status information) with -l: show ctime and sort by name otherwise: sort by ctime

in order to execute a program in java and wait for it to finish you can use this post

Answer 2

/bin/sh is a program, this is the shell, the option -c specifies that the following is a command to be executed by the shell (which is the third "line" of your cmd1: cd ../.. && ls )

EDIT:

In this case is nessesary to execute the shell, executing only cd ../.. && ls won't work, because operators like the && between cd and ls are not understood by Java but by the shell.