如何设置一个bash shell脚本里面的一个别名，这样是从外部看到？ [英] How to set an alias inside a bash shell script so that is it visible from the outside?

问题描述

OSX：这个工程在命令行：

OSX: This works from the command line:

alias ruby="/opt/local/bin/ruby1.9"

但在一侧的shell脚本，它没有任何效果。我想编写一个脚本，将红宝石1.8和1.9红宝石之间进行切换，所以这需要一个剧本 - 不是我的个人资料

but in side a shell script, it has no effect. I want to write a script that will switch between ruby 1.8 and ruby 1.9, so this needs to be a script - not in my profile.

看来源script.sh的作品，但./script.sh。为什么是这样？我怎么能在我的脚本复制呢？

It appears "source script.sh" works, but "./script.sh". Why is this? How can I replicate this in my script?

推荐答案

./ script.sh 将在一个子shell执行，并且所做的更改仅适用子壳。一旦终止命令，子shell那张等方面做了修改。

./script.sh will be executed in a sub-shell and the changes made apply only the to sub-shell. Once the command terminates, the sub-shell goes and so do the changes.

使用采购文件。 ./script.sh 或源./script.sh 将读取并在当前shell的上下文从文件名参数执行命令，那当一个脚本中使用源它现有的外壳内运行运行，由脚本创建或修改的变量将在脚本完成后仍然可用。

sourcing the file using . ./script.sh or source ./script.sh will read and execute commands from the file-name argument in the current shell context, that is when a script is run using source it runs within the existing shell, any variables created or modified by the script will remain available after the script completes.

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