使用 Runtime.getRuntime().exec 时遇到问题 [英] Trouble using Runtime.getRuntime().exec

问题描述

我在 mac 中使用以下 cmds 但它不起作用，对此有何想法?

I am using the below cmds in mac and It doesn't work, any thoughts on this?

String[] cmdline = { "echo", "symc", "|", "sudo", "-S", "rm", "-f", "/Applications/Test application.app" };
Runtime.getRuntime().exec(cmdline);

我也尝试过，但没有成功:

I also tried but in vain:

Process p = Runtime.getRuntime().exec("echo symc | sudo -S rm -rf /Applications/Test application.app");

有什么建议吗?

推荐答案

您传递给 exec 的不是在 shell 中运行的任意命令行，而是要启动的进程的名称与其论据.因此，如果你想要管道，甚至只是 echo 命令，它不是一个常规的可执行文件，你必须显式地启动一个新的 shell，沿着命令行传递执行.类似的东西

What you pass to exec is not an arbitrary command line that works in a shell, but the name of a process to start along with its arguments. Therefore, if you want piping, and even just the echo command, which is not a regular executable, you must start a new shell explicitly, passing along the command line to execute. Something like

sh -c echo ...

所以这应该有效:

String[] cmdline = { "sh", "-c", "echo symc | sudo -S rm -rf /Applications/Test application.app" };
Runtime.getRuntime().exec(cmdline);

注意，如果你想使用管道，你应该只给 -c 一个参数.

Note that you should give -c only a single argument if you want to use pipes.

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