如何在 bash 中为导出设置别名
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How to alias an export in bash
提问by Sreeram Ravinoothala
I am trying to set an env variable which I can use to do relative directory chanes. I am trying to do it the following way but cant get it to work. How do I do it?
我正在尝试设置一个 env 变量，我可以用它来做相对目录的更改。我正在尝试按以下方式执行此操作，但无法使其正常工作。我该怎么做？
alias sroot="export SROOT="$PWD""
alias drumit="cd $SROOT/abc/def/drumit"
If I type sroot, it takes the alias but when i type drumit, it gives me an error saying
如果我输入 sroot，它会使用别名，但是当我输入drumit 时，它会给我一个错误提示
bash: cd: /abc/def/drumit: No such file or directory
Looks like when the shell was launced it takes $SROOTas .Appreciate any help.
看起来像当外壳被launced它需要$SROOT为.感谢所有帮助。
Thanks
谢谢
回答by Keith
Your $PWD and $SROOT variables are being expanded at the time you define the aliases, not when you are using them. Put a \ in front of them to escape them while they are defined.
您的 $PWD 和 $SROOT 变量在您定义别名时被扩展，而不是在您使用它们时。在定义它们时在它们前面放一个 \ 以逃避它们。
alias sroot="export SROOT="$PWD""
alias drumit="cd $SROOT/abc/def/drumit"
回答by chown
When you initially set the alias, it expands $PWDinstead of keeping it as the variable form. Try using functioninstead like this:
当您最初设置别名时，它会扩展$PWD而不是将其保留为变量形式。尝试function像这样使用：
$ function sroot {
> export SROOT="$PWD"
> }
$ export -f sroot
$ function drumit {
> cd $SROOT/cron
> }
$ export -f drumit
$ declare -f sroot
sroot()
{
export SROOT="$PWD"
}
$ declare -f drumit
drumit ()
{
cd $SROOT/abc/def/drumit
}
This is what is currently happening when you alias like in your question (variable expanding):
当您在问题中使用别名（变量扩展）时，这就是当前正在发生的事情：
$ alias sroot="export SROOT="$PWD""
$ alias drumit="cd $SROOT/abc/def/drumit"
$ alias
alias SROOT='/home/jon'
alias drumit='cd /home/jon/abc/def/drumit'
alias sroot='export SROOT=/home/jon'
Escaping would work too:
转义也可以：
$ alias sroot="export SROOT="$PWD""
$ alias drumit="cd $SROOT/abc/def/drumit"
$ alias
alias drumit='cd $SROOT/abc/def/drumit'
alias sroot='export SROOT=$PWD'
