"./somescript.sh"和"./somescript.sh"之间有什么区别?和". ./somescript.sh" [英] What is the difference between "./somescript.sh" and ". ./somescript.sh"

问题描述

今天，我按照一些说明在Linux中安装软件.有一个脚本需要首先运行.它设置一些环境变量.

Today I was following some instructions to install a software in Linux. There was a script that needs to be run first. It sets some environment variables.

该指令告诉我执行. ./setup.sh，但是我通过执行./setup.sh犯了一个错误.因此未设置环境.最后，我注意到了这一点并继续进行.

The instruction told me to execute . ./setup.sh, but I made a mistake by executing ./setup.sh. So the env was not set. Finally I noticed this and proceeded.

我想知道这两种调用脚本方法之间的区别.我对Linux完全陌生，因此请尽可能详细.

I want to know the difference between these two methods of invoking a script. I am completely new to Linux so please be as elaborate as possible.

推荐答案

./setup.sh运行该脚本，将启动一个新的运行该脚本的shell.新的外壳程序不会影响启动脚本的父外壳程序.

./setup.sh runs the script, a new shell will be started that runs the script. That new shell cannot affect the parent shell that started the script.

. ./setup.sh是source ./setup.sh的简写，它将在当前shell中运行该脚本，而不是启动一个新的shell来运行它.这意味着脚本可以更改当前shell的行为，例如设置新的环境变量.

. ./setup.sh is a shorthand for source ./setup.sh and it will run the script in the current shell, instead of starting a new shell to run it. This means the script can alter the behavior of the current shell, e.g. set new environment variables.

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