Bash - 导出带有特殊字符 ($) 的环境变量
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Bash - export environment variables with special characters ($)
提问by User
I'm parsing a file with key=valuedata and then export them as environment variables. My solution works, but not with special characters, example:
我正在解析带有key=value数据的文件，然后将它们导出为环境变量。我的解决方案有效，但不适用于特殊字符，例如：
.data
。数据
VAR1=abc
VAR2=d#r3_P{os-!kblg1$we3d4xhshq7=mf$@6@3l^
script.sh
脚本文件
#!/bin/bash
while IFS="=" read -r key value; do
case "$key" in
'#'*) ;;
*)
eval "$key=\"$value\""
export $key
esac
done < .data
$ . ./script.sh
$ . ./script.sh
Output:
输出：
$ echo $VAR1
abc
$ echo $VAR2
d#r3_P{os-!kblg1=mf6@3l^
but should be: d#r3_P{os-!kblg1$we3d4xhshq7=mf$@6@3l^
但应该是： d#r3_P{os-!kblg1$we3d4xhshq7=mf$@6@3l^
采纳答案by Inian
You don't need evalat all, just use declarebuilt-in in bashto create variables on-the-fly!
您根本不需要eval，只需使用declare内置的bash来即时创建变量！
case "$key" in
'#'*) ;;
*)
declare $key=$value
export "$key"
esac
回答by Yedidia
Just escape the $ sign with backslash \
只需用反斜杠 \ 转义 $ 符号
回答by Rogus
If you cannot change the .datafile you have to escape the special character $when assigning the value to key. Change the assignment line to:
如果您无法更改.data文件，则必须$在将值分配给键时转义特殊字符。将分配行更改为：
eval "$key=\"${value//$/\$}\""
${variable//A/B}means substituting every instance of Ato Bin variable.
${variable//A/B}意味着替换Ato Bin 的每个实例variable。
More useful info on bash variables here
关于 bash 变量的更多有用信息在这里
