bash 使用 jq 分配多个输出变量
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using jq to assign multiple output variables
提问by user2328273
I am trying to use jqto parse information from the TVDB api. I need to pull a couple of fields and assign the values to variables that I can continue to use in my bashscript. I know I can easily assign the output to one variable through bash with variable="$(command)"but I need the output to produce multiple variables and I don't want to make to use multiple commands.
我正在尝试用于jq解析来自TVDB api 的信息。我需要提取几个字段并将值分配给我可以继续在我的bash脚本中使用的变量。我知道我可以通过 bash 轻松地将输出分配给一个变量，variable="$(command)"但我需要输出来生成多个变量，而且我不想使用多个命令。
I read this documentation:
我阅读了这个文档：
https://stedolan.github.io/jq/manual/v1.5/#Advancedfeatures
https://stedolan.github.io/jq/manual/v1.5/#Advancedfeatures
but I don't know if this relevant to what I am trying to do.
但我不知道这是否与我正在尝试做的有关。
jq '.data'produces the following output:
jq '.data'产生以下输出：
[
{
"absoluteNumber": 51,
"airedEpisodeNumber": 6,
"airedSeason": 4,
"airedSeasonID": 680431,
"dvdEpisodeNumber": 6,
"dvdSeason": 4,
"episodeName": "We Will Rise",
"firstAired": "2017-03-15",
"id": 5939660,
"language": {
"episodeName": "en",
"overview": "en"
},
"lastUpdated": 1490769062,
"overview": "Clarke and Roan must work together in hostile territory in order to deliver an invaluable asset to Abby and her team."
}
]
I tried jq '.data | {episodeName:$name}'and jq '.data | .episodeName as $name'just to try and get one working. I don't understand the documentation or even if it's what I'm looking for. Is there a way to do what I am trying to do?
我试过jq '.data | {episodeName:$name}'，jq '.data | .episodeName as $name'只是想让一个工作。我不理解文档，即使它是我正在寻找的。有没有办法做我想做的事？
采纳答案by Bertrand Martel
You can use separate variables with read:
您可以使用单独的变量read：
read var1 var2 var3 < <(echo $(curl -s 'https://api.github.com/repos/torvalds/linux' |
jq -r '.id, .name, .full_name'))
echo "id : $var1"
echo "name : $var2"
echo "full_name : $var3"
Using array :
使用数组：
read -a arr < <(echo $(curl -s 'https://api.github.com/repos/torvalds/linux' |
jq -r '.id, .name, .full_name'))
echo "id : ${arr[0]}"
echo "name : ${arr[1]}"
echo "full_name : ${arr[2]}"
Also you can split jqoutput with some character :
你也可以用一些字符分割jq输出：
IFS='|' read var1 var2 var3 var4 < <(curl '......' | jq -r '.data |
map([.absoluteNumber, .airedEpisodeNumber, .episodeName, .overview] |
join("|")) | join("\n")')
Or use an array like :
或者使用像这样的数组：
set -f; IFS='|' data=($(curl '......' | jq -r '.data |
map([.absoluteNumber, .airedEpisodeNumber, .episodeName, .overview] |
join("|")) | join("\n")')); set +f
absoluteNumber, airedEpisodeNumber, episodeName& overvieware respectively ${data[0]}, ${data[1]}, ${data[2]}, ${data[3]}. set -fand set +fare used to respectively disable & enable globbing.
absoluteNumber, airedEpisodeNumber, episodeName&overview分别是${data[0]}, ${data[1]}, ${data[2]}, ${data[3]}。set -f和set +f分别用于禁用和启用globbing。
For the jqpart, all your required fields are mapped and delimited with a '|'character with join("|")
对于jq部分，所有必填字段都被映射并用一个'|'字符分隔join("|")
If your are using jq < 1.5, you'll have to convert Number to String with tostringfor each Number fields eg:
如果您使用的是 jq < 1.5，则必须tostring为每个数字字段将数字转换为字符串，例如：
IFS='|' read var1 var2 var3 var4 < <(curl '......' | jq -r '.data |
map([.absoluteNumber|tostring, .airedEpisodeNumber|tostring, .episodeName, .overview] |
join("|")) | join("\n")')
回答by peak
jq always produces a stream of zero or more values. For example, to produce the two values corresponding to "episodeName" and "id"' you could write:
jq 总是产生零个或多个值的流。例如，要生成对应于“episodeName”和“id”'的两个值，您可以编写：
.data[] | ( .episodeName, .id )
For your purposes, it might be helpful to use the -c command-line option, to ensure each JSON output value is presented on a single line. You might also want to use the -r command-line option, which removes the outermost quotation marks from each output value that is a JSON string.
出于您的目的，使用 -c 命令行选项可能会有所帮助，以确保每个 JSON 输出值都显示在一行中。您可能还想使用 -r 命令行选项，它会从每个 JSON 字符串输出值中删除最外层的引号。
For further variations, please see the jq FAQ https://github.com/stedolan/jq/wiki/FAQ, e.g. the question:
有关进一步的变化，请参阅 jq 常见问题解答https://github.com/stedolan/jq/wiki/FAQ，例如问题：
Q: How can a stream of JSON texts produced by jq be converted into a bash array of corresponding values?
问：jq 生成的 JSON 文本流如何转换为对应值的 bash 数组？
回答by agc
Experimental conversion of quoted OP input, (tv.dat), to a series of bashvariables, (and an array). The jqcode is mostly borrowed from here and there, but I don't know how to get jqto unroll an array within an array, so the sedcode does that, (that's only good for one level, but so are basharrays):
带引号的 OP 输入（tv.dat）到一系列bash变量（和一个数组）的实验转换。该jq代码主要是从这里借来的，有，但我不知道怎么去jq解开一个阵列内的阵列，所以sed代码这样做，（这只是一个水平不错，而且还有bash阵列）：
jq -r ".[] | to_entries | map(\"DAT_\(.key) \(.value|tostring)\") | .[]" tv.dat |
while read a b ; do echo "${a,,}='$b'" ; done |
sed -e '/{.*}/s/"\([^"]*\)":/[]=/g;y/{},/() /' -e "s/='(/=(/;s/)'$/)/"
Output:
输出：
dat_absolutenumber='51'
dat_airedepisodenumber='6'
dat_airedseason='4'
dat_airedseasonid='680431'
dat_dvdepisodenumber='6'
dat_dvdseason='4'
dat_episodename='We Will Rise'
dat_firstaired='2017-03-15'
dat_id='5939660'
dat_language=([episodeName]="en" [overview]="en")
dat_lastupdated='1490769062'
dat_overview='Clarke and Roan must work together in hostile territory in order to deliver an invaluable asset to Abby and her team.'
