“无效算术运算符"外壳 [英] "invalid arithmetic operator" in shell

问题描述

cat test.sh

cat test.sh

#!/bin/bash
key="index";
arr[$key]="val"
echo ${arr[${key}]}

/bin/bash-x test.sh

/bin/bash-x test.sh

+ key=index
+ arr[$key]=val
+ echo val
val

然后我修改test.sh:

then I modify the test.sh:

#!/bin/bash
key="index.index";
arr[$key]="val"
echo ${arr[${key}]}

/bin/bash -x test.sh

/bin/bash -x test.sh

+ key=index.index
+ arr[$key]=val
test.sh: line 3: index.index: syntax error: invalid arithmetic operator (error token is ".index")
test.sh: line 4: index.index: syntax error: invalid arithmetic operator (error token is ".index")

为什么会出现此错误，任何建议将不胜感激！

why this error appears, any suggestion will be appreciate!

推荐答案

使用declare -A arr将数组变量声明为关联数组.

Declare the array variable as an associative array with declare -A arr.

$ cat test.sh 
#!/bin/bash
set -x 
declare -A arr
key="index.index";
arr["$key"]="val"
echo "${arr["${key}"]}"

$ ./test.sh 
+ declare -A arr
+ key=index.index
+ arr["$key"]=val
+ echo val
val

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