Bashjq解析json字符串

Question

我必须调用一个文件并以这种方式传递一个 json 作为参数（假设我的文件名为 test.sh），从 bash 我需要做这样的事情：

./test.sh "[{\"username\":\"user1\",\"password\":\"pwd1\",\"group\":\"usergroup1\"},{\"username\":\"user2\",\"password\":\"pwd2\",\"group\":\"usergroup2\"},{\"username\":\"user3\",\"password\":\"pwd3\",\"group\":\"usergroup3\"}]"

而test.sh的内容如下

#!/bin/bash

#read the json
system_user=""

printf "$system_user"

accounts=($(jq -s ".[]" <<< $system_user))

printf "$accounts"

for account in "${accounts[@]}"
do
  printf "\n\n$account\n\n"
done

-> printf "$system_user" 的输出是

[{"username":"user1","password":"pwd1","group":"usergroup1"},{"username":"user2","password":"pwd2","group":"usergroup2"},{"username":"user3","password":"pwd3","group":"usergroup3"}]

但是 -> printf "$accounts" 的输出是这样的

[
[
{
"username":
"user1"
等等等等。每个令牌一个对象:-(

等等，但我期待的是一个包含三个对象的数组（就像您可以在 jqplay.org 上测试）

 {
   "username": "user1",
   "password": "pwd1",
   "group": "usergroup1"
 }
 {
   "username": "user2",
   "password": "pwd2",
   "group": "usergroup2"
 }
 {
   "username": "user3",
   "password": "pwd3",
   "group": "usergroup3"
 }

通过这种方式，我可以在 ${accounts[@]}

上创建一个 foreach

我做错了什么？谢谢

Answer 1

您正在交换 bash 个数组和 JSON 个数组。当您创建 accounts 数组时，bash 按每个空格拆分元素。这就是为什么你没有得到你所期望的。您可以尝试以下方法：

declare -A accounts

while IFS="=" read -r key value
do
    accounts[$key]="$value"
done < <(jq -r "to_entries|map(\"\(.key)=\(.value)\")|.[]" <<< $system_user)

for account in "${accounts[@]}"
do
    printf "$account\n"
done

（从这里偷来的：）

得到以下输出：

{"username":"user1","password":"pwd1","group":"usergroup1"}
{"username":"user2","password":"pwd2","group":"usergroup2"}
{"username":"user3","password":"pwd3","group":"usergroup3"}

Answer 2

使用 -c 选项，您可以在一行中打印每个 JSON 对象，从而更容易填充所需的数组。

$ readarray -t arr < <(jq -c '.[]' <<< "[{\"username\":\"user1\",\"password\":\"pwd1\",\"group\":\"usergroup1\"},{\"username\":\"user2\",\"password\":\"pwd2\",\"group\":\"usergroup2\"},{\"username\":\"user3\",\"password\":\"pwd3\",\"group\":\"usergroup3\"}]") 
$ printf "Object: %s\n" "${arr[@]}"
Object: {"username":"user1","password":"pwd1","group":"usergroup1"}
Object: {"username":"user2","password":"pwd2","group":"usergroup2"}
Object: {"username":"user3","password":"pwd3","group":"usergroup3"}

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