Shell处理json数据的方法，简单介绍一下，本文基于CentOS 7 64bit。

yum install jq                     #需要EPEL源

下面我们有一个config.json文件

{
  "USERNAME": "admin",
  "CLUSTERMAP_HOSTS": {
      "staging":{
          "pc": "10.191.130.70",
          "app": "10.191.76.250",
          "wx": "172.28.172.171"
      },
      "production":{
          "mjq_pc":"172.28.139.30",
          "mjq_app":"172.28.148.150",
          "mjq_weixin":"172.28.149.84",
          "mjq_qq":"172.28.149.77",
          "lf_pc":"172.20.145.51",
          "lf_app":"172.20.145.40",
          "lf_weixin":"172.20.145.86",
          "lf_qq":"172.20.112.150",
          "jos":"172.20.145.50",
          "lf_coupon":"172.20.112.44",
          "mjq_coupon":"172.28.139.48"
      },
      "ab":{
          "mjq_pc":"172.28.175.36",
          "lf_app":"172.20.121.107"
      }
  },
  "CLUSTERMAP_BINARY_PATH": "/export/App/helloworld/clustermap/bin"
}

获得某1个key的value

$ jq '.CLUSTERMAP_HOSTS.production' config.json 
{
  "mjq_pc": "172.28.139.30",
  "mjq_app": "172.28.148.150",
  "mjq_weixin": "172.28.149.84",
  "mjq_qq": "172.28.149.77",
  "lf_pc": "172.20.145.51",
  "lf_app": "172.20.145.40",
  "lf_weixin": "172.20.145.86",
  "lf_qq": "172.20.112.150",
  "jos": "172.20.145.50",
  "lf_coupon": "172.20.112.44",
  "mjq_coupon": "172.28.139.48"
}


$ jq '.CLUSTERMAP_HOSTS.production.mjq_pc' config.json
"172.28.139.30"

获得某些(多个)key的value

$ jq '.CLUSTERMAP_HOSTS | .production, .ab' config.json 
{
  "mjq_pc": "172.28.139.30",
  "mjq_app": "172.28.148.150",
  "mjq_weixin": "172.28.149.84",
  "mjq_qq": "172.28.149.77",
  "lf_pc": "172.20.145.51",
  "lf_app": "172.20.145.40",
  "lf_weixin": "172.20.145.86",
  "lf_qq": "172.20.112.150",
  "jos": "172.20.145.50",
  "lf_coupon": "172.20.112.44",
  "mjq_coupon": "172.28.139.48"
}
{
  "mjq_pc": "172.28.175.36",
  "lf_app": "172.20.121.107"
}

获得key列表

$ jq '.CLUSTERMAP_HOSTS.production | keys' config.json 
[
  "jos",
  "lf_app",
  "lf_coupon",
  "lf_pc",
  "lf_qq",
  "lf_weixin",
  "mjq_app",
  "mjq_coupon",
  "mjq_pc",
  "mjq_qq",
  "mjq_weixin"
]

获得某个key下面的所有value(列表形式)

$ cat config.json | jq '[ .CLUSTERMAP_HOSTS.production[] ]'
[
  "172.28.139.30",
  "172.28.148.150",
  "172.28.149.84",
  "172.28.149.77",
  "172.20.145.51",
  "172.20.145.40",
  "172.20.145.86",
  "172.20.112.150",
  "172.20.145.50",
  "172.20.112.44",
  "172.28.139.48"
]

获得某个key下面的所有value(文本形式)

$ cat config.json | jq ' .CLUSTERMAP_HOSTS.production[] '
"172.28.139.30"
"172.28.148.150"
"172.28.149.84"
"172.28.149.77"
"172.20.145.51"
"172.20.145.40"
"172.20.145.86"
"172.20.112.150"
"172.20.145.50"
"172.20.112.44"
"172.28.139.48"

获得所有key下面的所有value

$ jq '.CLUSTERMAP_HOSTS[][]' config.json 
"10.191.130.70"
"10.191.76.250"
"172.28.172.171"
"172.28.139.30"
"172.28.148.150"
"172.28.149.84"
"172.28.149.77"
"172.20.145.51"
"172.20.145.40"
"172.20.145.86"
"172.20.112.150"
"172.20.145.50"
"172.20.112.44"
"172.28.139.48"
"172.28.175.36"
"172.20.121.107"

参考文档：
jq : Linux下json的命令行工具
jq parsing get value