如何正确地从groovy调用shell命令 [英] how to call shell commands from groovy correctly

问题描述

我想从我的groovy脚本执行shell命令。
我测试了以下：

i want to execute shell commands from my groovy script. I tested the following:

"mkdir testdir".execute()

这只是工作正常。
现在我想创建一个文件，写入文件，然后打开一个文本编辑器来查看文件。

and this just works fine. Now i wanted to make a file, write something to the file and then open a text editor to view the file.

def execute(cmd) {
   def proc =  cmd.execute()
   proc.waitFor()
}

execute("touch file")
execute("echo hello > file")
execute("gedit file")

现在gedit打开正确，但在文件中没有hello字符串。
这是如何工作的？

Now gedit opens correctly but ther is no "hello" string in the file. How is this working?!?

推荐答案

您不能在行中重定向：

execute("echo hello > file")

所以没有任何东西写入文件。

So nothing gets written to the file. The easiest way to handle this is probably to wrap all your commands into a single shell script, then execute this script.

否则，你可以读取标准的输出。

Otherwise, you can read the standard output from the echo command (without the > file), and then write this to file yourself in Groovy.

或您可以：

execute( [ 'bash', '-c', 'echo hello > file' ] )

这应该作为执行方法将执行 List.execute（）方法

Which should work as your execute method will just perform the List.execute() method

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