C编程。打印当前用户 [英] C Programming. Printing current user

问题描述

在C编程中，如何获取当前用户和当前工作目录。
我试图打印这样的东西：

In C programming how do you get the current user and the current working directory. I'm trying to print something like this:

  asmith@mycomputer:~/Desktop/testProgram:$
  (user) (computerName) (current directory)

我有以下代码，用户名显示为NULL。任何想法我在做错什么？

I have the following code, but the username is showing as NULL. Any ideas what I'm doing wrong?

void prompt()
{
        printf("%s@shell:~%s$", getenv("LOGNAME"), getcwd(currentDirectory, 1024));                 
}

推荐答案

请注意，一个unix系统。

可能是LOGNAME未设置为您的环境变量
您可以使用 printenv 命令查看环境变量

Note that this will work on a unix system only.
may be LOGNAME was not set as your environment variable you can see the environment variables using the printenv command

printf("%s@shell:%s$", getenv("USER"),getenv("PWD"))

此工作也是这样。

但是如上所述你应该不要依赖环境变量，而是使用标准的c函数。如果你真的想使用它们，首先要确定它是否设置。

but as mentioned you shouldn't rely on environment variables, rather use the standard c functions.If you really want to use them, first make sure it is set.

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