在ProcessBuilder中執行echo命令

Question

我想執行echo 'obase=94; 100' | bc >>out.txt echo 'obase=94; 100' | bc >>out.txt echo 'obase=94; 100' | bc >>out.txt我已經用過了

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

在out.txt里面我看到'obase=94; 100' | bc' 'obase=94; 100' | bc' 'obase=94; 100' | bc'而不是01 06

我哪里錯了？

Answer 1

| 需要由shell解釋。

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