CODEWITHSUNDEEP
javamacosshellterminal
Ryainad
Ryainad

Reputation: 219

Run a command that uses pipes in terminal on Mac using Java

I have a command to run on Terminal OSX:

cat File1 | ./huawei2text.pl > ~/File2.txt && cat ~/File2.txt| tr "," "\n"  > ~/Output.txt

How can I run this command using only java?

I tried this code:

String whatToRun = "cat File1 | ./File.pl > ~/File2.txt && cat ~/File2.txt| tr "," "\n"  > ~/Output.txt";
   try
   {
     Runtime rt = Runtime.getRuntime();
     Process proc = rt.exec(whatToRun);
     int exitVal = proc.waitFor();
     System.out.println("Process exitValue:" + exitVal);
   } catch (Throwable t)
     {
       t.printStackTrace();
     }

Updated

Answer and solution:

String whatToRun = "cat File1 | ./File.pl > File2.txt "
            + "&& cat File2.txt| tr \",\" \"\n\"  > Output.txt";
String[] shellcmd = {"/bin/sh", "-c", whatToRun};

try {
    Runtime rt = Runtime.getRuntime();
    Process proc = rt.exec(shellcmd);
    int exitVal = proc.waitFor();
    System.out.println("Process exitValue:" + exitVal);
    }
catch (Throwable t) {
    t.printStackTrace();
}

Now It works. Thank you!

Upvotes: 0

Views: 1202

Answers (2)

devnull
devnull

Reputation: 123508

Pipes would be interpreted by the shell. Ask your shell to execute the command instead:

String[] shellcmd = {
  "/bin/sh",
  "-c",
  whatToRun
};

Process proc = rt.exec(shellcmd);

Upvotes: 2

Marko Topolnik
Marko Topolnik

Reputation: 200168

The Java API allows you to start one subprocess, by naming an executable to run. What you have there is a whole mini-script banged together into a one-liner. Only a shell can interpret such things, so your string should start with something like

/bin/sh -c '... your command ...'

Note the single quotes, they are important.

Upvotes: 0

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