如何将环境变量放在数组中? [英] How to put environment variable in Array?

问题描述

DIR1，DIR2，....DIRN来自包含某些目录路径的环境变量. 例子

DIR1, DIR2, .... DIRN are coming from environment variables that contains some directory path. example

export DIR1="/users/abcd"
export DIR2="/users/abcd/xyz"
.
.
.

我怎么知道环境变量中有多少DIR_并将所有这些放在下面的数组中

How do i know that how many DIR_ is in environment variable and put all these in the following array

arr=(DIR1 DIR2 ... . . DIRN)
i=0
while [ $i -lt ${#arr[@]} ] 
do
      cd ${arr[$i]}
      i=`expr $i + 1`
done

推荐答案

对于环境变量的值中可能包含换行符的情况，您可以使用此脚本，该脚本使用printenv和awk的gnu版本.

For the cases when environment variables may contain newlines in their values you can use this script that uses gnu versions of printenv and awk.

mapfile -t arr < <(printenv -0 | awk -v RS='\0' -F= '/^DIR/{print $1}')

然后将您的数组内容检查为:

Then check your array content as:

declare -p arr

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