CHDIR（）不影响环境变量PWD [英] chdir() not affecting environment variable PWD

问题描述

当我使用CHDIR（）来改变当前的工作目录下，为什么不GETENV（PWD）给予present工作目录？我需要SETENV（PWD，NEWDIR，1）也？

When I use chdir() to change the current working directory, why doesn't the getenv("PWD") give the present working directory? Do I need to setenv("PWD",newDir,1) also?

void intChangeDir(char *newDir)
{
    if( chdir(newDir)==0 )              
    {
        printf("Directory changed. The present working directory is \"%s\" \"%s\"\n",getenv("PWD"),getcwd(NULL,0));
    }
    else
    {
        printf("Error changing dir %s\n",strerror(errno));      
    }
}

输出：（可执行文件的位置是/ home /用户）

Output: (location of the executable is /home/user)

changedir的/ boot

changedir /boot

目录改变。在present工作目录是/ home / user中/启动

Directory changed. The present working directory is "/home/user" "/boot"

推荐答案

是的，如果你想改变环境变量，你必须明确地做到这一点。

Yes, if you want to change the environment variable, you have to explicitly do that.

这是外壳，设置并在事件的正常运行更新 PWD ，所以它只反映已知的外壳当前目录的变化。

It's shell that sets and updates PWD in the normal run of events, so it only reflects changes of the current directory known to the shell.

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