在Linux Bash中从cURL获取JSON值 [英] Getting JSON value from cURL in Linux Bash

问题描述

我想从服务器 GET 一些json数据。我这样使用：

I want to GET some json data from a server. I do this using:

UPDATE=$(curl -i -H "Accept: application/json" -H "Content-Type: application/json" --cookie "${COOKIE_NAME}" "${1}/update/${DEVICE_NAME}");

在此之前，服务器已通过身份验证。 $ {1} 是服务器域， $ {DEVICE_NAME} 是请求更新的设备的名称。

Before this, the server is authenticated. The ${1} is the server domain, ${DEVICE_NAME} is the name of the device requesting the update.

这会传回JSON，如下所示：

This returns a JSON as follows:

[{_ id： 54ff35887d8ef574029b9166，user：54fe4313883bcec2c0ac0d64，__v：0，created：2015-03-10T18：18：48.023Z，status：available，pbo_udid：lemaker ，installation_script：，description：prints
hello world to
console，package_name：helloworld_1.0-1.deb，name：Hello World
V1}]

[{"_id":"54ff35887d8ef574029b9166","user":"54fe4313883bcec2c0ac0d64","__v":0,"created":"2015-03-10T18:18:48.023Z","status":"available","pbo_udid":"lemaker","installation_script":"","description":"Prints hello world to console","package_name":"helloworld_1.0-1.deb","name":"Hello World V1"}]

我现在要做2件事：

1. 确保返回数据（如果没有更新可用，服务器返回 []


2. 提取数据，例如 package_name

1. Make sure data is returned (if no update is available, the server returns []
2. Extract data, for instance package_name

如何在Linux bash script？

How do I do these in Linux bash script?

推荐答案

假设没有嵌套数组：

cat <<EOF | json_reformat | \
    sed -rne '/:/s@^\s+"(\w+)":\s+"([^"]+)",?@json_\1="\2"@gp'
[{"_id":"54ff35887d8ef574029b9166","user":"54fe4313883bcec2c0ac0d64","__v":0,"created":"2015-03-10T18:18:48.023Z","status":"available","pbo_udid":"lemaker","installation_script":"","description":"Prints hello world to console","package_name":"helloworld_1.0-1.deb","name":"Hello World V1"}]
EOF

返回

json__id="54ff35887d8ef574029b9166"
json_user="54fe4313883bcec2c0ac0d64"
json_created="2015-03-10T18:18:48.023Z"
json_status="available"
json_pbo_udid="lemaker"
json_description="Prints hello world to console"
json_package_name="helloworld_1.0-1.deb"
json_name="Hello World V1"

$ b b

您需要 json_reformat 才能使用。

EDIT ：without json_reformat ：

EDIT : without json_reformat:

cat <<EOF | \
    sed -re 's@(\[|\]|\{|\})@@g' -e 's/,/\n/g' | \
    sed -re 's@"(\w+)":\s*"?([^"]*)"?@json_\1="\2"@g'
[{"_id":"54ff35887d8ef574029b9166","user":"54fe4313883bcec2c0ac0d64","__v":0,"created":"2015-03-10T18:18:48.023Z","status":"available","pbo_udid":"lemaker","installation_script":"","description":"Prints hello world to console","package_name":"helloworld_1.0-1.deb","name":"Hello World V1"}]
EOF

它返回（注意无论如何都要重新格式化的版本号） ：

It returns (note the version number that is reformatted anyway):

json__id="54ff35887d8ef574029b9166"
json_user="54fe4313883bcec2c0ac0d64"
json___v="0"
json_created="2015-03-10T18:18:48.023Z"
json_status="available"
json_pbo_udid="lemaker"
json_installation_script=""
json_description="Prints hello world to console"
json_package_name="helloworld_1.0-1.deb"
json_name="Hello World V1"

现在可以尝试使用 eval 解析此文本或从stdin源代码。

You can now try parsing this text using eval or source it from stdin.

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