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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