[Linux] Parser JSON Parser For Linux Command-Line

jq command是一個command-line的processor。

Ubuntu安裝方式如下：

#apt-get install jq

使用方法：

• 取得物件裡的值，Ex1 : {"obj":1, "desc": "object1", "inobj":{"desc":"in-object1"}}
  //取得obj
  #jq '.obj'
  =>1
  
  //取得obj1
  #jq '.obj1'
  =>null
  
  //取得inobj1.desc
  #jq '.inobj.desc'
  =>in-object1
  
  //取得key
  #jq 'keys'
  =>["obj","desc","inobj"]
  
  
  
  
• 取得陣列，Ex2 : [{"obj":1, "desc": "object1"},{"obj":2, "desc": "object2"},{"obj":3, "desc": "object3"}]
  // 取得第一個物件.[0]
  #jq '.[0]'
  =>{"obj":1, "desc": "object1"}
  
  // 取得所有物件.[]
  #jq '.[]'
  =>{"obj":1, "desc": "object1"},{"obj":2, "desc": "object2"},{"obj":3, "desc": "object3"}
  
  // 取得1~2物件.[1:2]
  #jq '.[1:2]'
  =>{"obj":2, "desc": "object2"},{"obj":3, "desc": "object3"}
  
  
  
  

Reference:
[1] https://stedolan.github.io/jq
[2] #man jq