jq安装

安装epel源
yum install epel-release -y
搜索jq命令软件包
yum search jq
yum -y install jq.x86_64
版本
jq -V
wget https://github.com/stedolan/jq/releases/download/jq-1.6/jq-linux64 -O /usr/local/bin/jq
chmod +x /usr/local/bin/
格式化，筛选信息，修改数据
测试数据
‘[{“name”: “wang”, “age”: 22, “job”: “studet”}, {“name”: “Li”, “age”: 33, “job”: “engineer”}, {“name”: “zhou”, “age”: 28, “job”: “manager”}]’

nano data.json
echo ‘[{“name”: “wang”, “age”: 22, “job”: “studet”}, {“name”: “Li”, “age”: 33, “job”: “engineer”}, {“name”: “zhou”, “age”: 28, “job”: “manager”}]’ > data.json

jq ‘.’ data.json
” jq的命令
. 当前json数据
1.格式
[
{
“name”: “wang”,
“age”: 22,
“job”: “studet”
},
{
“name”: “Li”,
“age”: 33,
“job”: “engineer”
},
{
“name”: “zhou”,
“age”: 28,
“job”: “manager”
}
]

echo ‘[{“name”: “wang”, “age”: 22, “job”: “studet”}, {“name”: “Li”, “age”: 33, “job”: “engineer”}, {“name”: “zhou”, “age”: 28, “job”: “manager”}]’ | jq ‘.’
同样会得到格式化的json数据
2.筛选
jq ‘.[]’ data.json

[root@VM-20-13-centos bin]# jq ‘.[0]’ data.json
{
“name”: “wang”,
“age”: 22,
“job”: “studet”
[root@VM-20-13-centos bin]# jq ‘.[1:3]’ data.json
[
{
“name”: “Li”,
“age”: 33,
“job”: “engineer”
},
{
“name”: “zhou”,
“age”: 28,
“job”: “manager”
}
]

通过键得到读写对应的值
[root@VM-20-13-centos bin]# jq ‘.[1].name’ data.json
“Li”
[root@VM-20-13-centos bin]# jq ‘.[1].job’ data.json
“engineer”
[root@VM-20-13-centos bin]# jq ‘.[1].name, .[1].job’ data.json
“Li”
“engineer”
或jq ‘.[1] | .name, .job ‘ data.json（用，将name和job隔开）
[root@VM-20-13-centos bin]# jq ‘.[1] | .name, .job’ data.json
“Li”
“engineer”
结果仍是一样
去除1将会得到列表每一个元素的name和job

3.jq修改json数据
[root@VM-20-13-centos bin]# jq ‘. | length’ data.json
3
[root@VM-20-13-centos bin]# jq ‘map(.name)’ data.json
[
“wang”,
“Li”,
“zhou”
]

[root@VM-20-13-centos bin]# jq ‘map(.job) ‘ data.json
[
“studet”,
“engineer”,
“manager”

jq ‘map(.job=”engineer”)’ data.json
[root@VM-20-13-centos bin]# jq ‘map(.age+1)’ data.json
[
23,
34,
29
]

jq ‘. | length’ data.json

jq ‘map(.name)’ data.json
jq ‘map(.age)’ data.json

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