Executing echo command in ProcessBuilder

Question

I want to execute echo 'obase=94; 100' | bc >>out.txt for that I have used

String[] cmd = {"echo" , "'obase=94; 100'" , " | bc"};
new ProcessBuilder().command(cmd).redirectOutput(ProcessBuilder.Redirect.appendTo(new File("out.txt"))).start();

Inside out.txt I see 'obase=94; 100' | bc' instead of 01 06

Where I am going wrong?

Answer 1

| needs to be interpreted by a shell.

String[] cmd = {"bash", "-c", "echo 'obase=94; 100' | bc"};