如何在jq中将整数作为参数? [英] How can I put integer as an argument in jq?

问题描述

我一直在尝试使用jq解析从aws cli返回的json文件，但是我一直困扰于使用索引号引用数组的问题.之所以需要这样做，是因为我想导出一个文本文件，以特定格式描述安全组，包括所有入站和出站规则.

I have been trying to use jq to parse a json file returned from the aws cli, but I'm stuck with the problem of referencing an array using the index number. I need to do this because I want to export a text file describing the security groups in a specific format, including all the inbound and outbound rules.

for (( i=1; i<=groupCount; i++ )) ; 
do
    echo $i
    echo $(echo "$input" | jq --arg i $i '.SecurityGroups[$i]')
done

这将返回错误:

1
jq: error (at <stdin>:189): Cannot index array with string "1"

2
jq: error (at <stdin>:189): Cannot index array with string "2"

3
jq: error (at <stdin>:189): Cannot index array with string "3"

有什么办法解决这个问题吗?

Is there any way around this?

推荐答案

您将不得不使用命令行arg --argjson或fromjson过滤器将参数转换为数字.数组只能通过int进行索引，并使用--arg将输入保留为字符串.

You would either have to use the command line arg --argjson or fromjson filter to convert the argument to a number. Arrays are may only be indexed by ints and using --arg keeps the input as a string.

$ jq --argjson i "$i" '.SecurityGroups[$i]'
$ jq --arg i "$i" '.SecurityGroups[$i|fromjson]'

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