给定JSON如下：

{"thing": ["hello", "bye"], "other": {"hello": "myval"}}

我想要一个jq表达式，它在"thing“下获取数组的第一个元素，并在"other”中查找它。所以我就这么做了：

jq '.thing[0] as $tofind | .other.$tofind'

但我得到了

jq: error: syntax error, unexpected '$', expecting FORMAT or QQSTRING_START (Unix shell quoting issues?) at <top-level>, line 1:
.thing[0] as $tofind | .other.$tofind
jq: 1 compile error

我尝试过很多其他的方法：

echo '{"thing": ["hello", "bye"], "other": {"hello": "myval"}}' | jq '.thing[0] as $tofind | .other.($tofind)'
jq: error: syntax error, unexpected '(', expecting FORMAT or QQSTRING_START (Unix shell quoting issues?) at <top-level>, line 1:
.thing[0] as $tofind | .other.($tofind)
jq: 1 compile error
echo '{"thing": ["hello", "bye"], "other": {"hello": "myval"}}' | jq '.thing[0] as $tofind | .other.[($tofind)]'
jq: error: syntax error, unexpected '[', expecting FORMAT or QQSTRING_START (Unix shell quoting issues?) at <top-level>, line 1:
.thing[0] as $tofind | .other.[($tofind)]
jq: 1 compile error
echo '{"thing": ["hello", "bye"], "other": {"hello": "myval"}}' | jq '.thing[0] as $tofind | .other.[$tofind]'
jq: error: syntax error, unexpected '[', expecting FORMAT or QQSTRING_START (Unix shell quoting issues?) at <top-level>, line 1:
.thing[0] as $tofind | .other.[$tofind]
jq: 1 compile error
echo '{"thing": ["hello", "bye"], "other": {"hello": "myval"}}' | jq '.thing[0] as $tofind | .other.["$tofind"]'
jq: error: syntax error, unexpected '[', expecting FORMAT or QQSTRING_START (Unix shell quoting issues?) at <top-level>, line 1: