如何使用 C 函数执行 Shell 内置命令? [英] How do I execute a Shell built-in command with a C function?

问题描述

我想通过像execv()这样的C语言函数来执行Linux命令pwd".

I would like to execute the Linux command "pwd" through a C language function like execv().

问题是没有名为pwd"的可执行文件，我无法执行echo $PWD"，因为 echo 也是一个内置命令，找不到可执行文件.

The issue is that there isn't an executable file called "pwd" and I'm unable to execute "echo $PWD", since echo is also a built-in command with no executable to be found.

推荐答案

你应该执行 sh -c echo $PWD;通常 sh -c 会执行 shell 命令.

You should execute sh -c echo $PWD; generally sh -c will execute shell commands.

(事实上，system(foo) 被定义为 execl("sh", "sh", "-c", foo, NULL) 并因此起作用用于 shell 内置函数.)

(In fact, system(foo) is defined as execl("sh", "sh", "-c", foo, NULL) and thus works for shell built-ins.)

如果您只想要PWD 的值，请使用getenv.

If you just want the value of PWD, use getenv, though.

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