json - 解析错误 : Invalid numeric literal at line 1, 第 2 列 (bash)

Question

我在 bash 中使用 json，但遇到了这个解析错误:

parse error: Invalid numeric literal at line 1, column 2

这段代码有什么问题？

jsonStr=$(cat << EOF
'{"key1": "value1", "key2": "value2", "key3": "value3"}'
EOF
)
jsonStr=$(jq 'del(.key3)' <<<"$jsonStr")
STRING="hello"
jsonStr=$(jq '. + {'"$STRING"': "value4"}' <<<"$jsonStr")
echo $jsonStr

Answer 1

$(cat << EOF ...)构造将单引号作为数据的一部分传递，即:

$ jsonStr=$(cat << EOF
'{"key1": "value1", "key2": "value2", "key3": "value3"}' 
EOF
)
$ echo "${jsonStr}"
'{"key1": "value1", "key2": "value2", "key3": "value3"}'

注意前导/尾随单引号。

要克服解析错误，您需要去掉单引号，例如:

$ jsonStr=$(cat << EOF
{"key1": "value1", "key2": "value2", "key3": "value3"}
EOF
)

# or

$ jsonStr='{"key1": "value1", "key2": "value2", "key3": "value3"}'

以上两者都给了我们:

$ echo "${jsonStr}"
{"key1": "value1", "key2": "value2", "key3": "value3"}

现在 jq/del按预期工作:

$ jq 'del(.key3)' <<< "${jsonStr}"
{
  "key1": "value1",
  "key2": "value2"
}

然后是 +操作也有效:

$ STRING="hello"
$ jq 'del(.key3)' <<< "${jsonStr}"  | jq '. + {'"$STRING"': "value4"}'
{
  "key1": "value1",
  "key2": "value2",
  "hello": "value4"
}

---

综合起来:

jsonStr='{"key1": "value1", "key2": "value2", "key3": "value3"}'
jsonStr=$(jq 'del(.key3)' <<< "${jsonStr}")
STRING="hello"
jsonStr=$(jq '. + {'"${STRING}"': "value4"}' <<< "${jsonStr}")
echo "${jsonStr}"

生成:

{
  "key1": "value1",
  "key2": "value2",
  "hello": "value4"
}