1. jq-test|⇒ cat test.json| jq '.["foo"]'
  2. 42
  3. jq-test|⇒ cat test.json
  4. {"foo": 42, "bar": "less interesting data"}
  5. jq-test|⇒ cat test.json| jq .foo
  6. 42
  7. jq-test|⇒ cat test.json| jq .no
  8. null
  10. # 有特殊字符时的查看方法
  11. jq-test|⇒ cat test.json| jq '.["foo"]'
  12. 42
  13. jq-test|⇒ cat test.json
  14. {"foo": 42, "bar": "less interesting data","42":12}
  15. jq-test|⇒ cat test.json| jq '.["42"]'
  16. 12
  17. jq-test|⇒ cat test.json| jq '."42"'
  18. 12
  20. jq-test|⇒ cat test.json| jq '.foo?'
  21. 42
  22. jq-test|⇒ cat test.json| jq '.foo7?'
  23. null
  24. jq-test|⇒ cat test.json| jq '[.foo?]'
  25. [
  26.   42
  27. ]

If the key contains special characters or starts with a digit, you need to surround it with double quotes like this: ."foo$", or else .["foo$"].

数组

  1. jq-test|⇒ cat 2.json
  2. [{"name":"JSON", "good":true}, {"name":"XML", "good":false}]
  3. jq-test|⇒ cat 2.json | jq .
  4. [
  5.   {
  6.     "name": "JSON",
  7.     "good": true
  8.   },
  9.   {
  10.     "name": "XML",
  11.     "good": false
  12.   }
  13. ]
  14. jq-test|⇒ cat 2.json | jq '.[]'
  15. {
  16.   "name": "JSON",
  17.   "good": true
  18. }
  19. {
  20.   "name": "XML",
  21.   "good": false
  22. }
  23. jq-test|⇒ cat 2.json | jq '.[0]'
  24. {
  25.   "name": "JSON",
  26.   "good": true
  27. }
  28. jq-test|⇒ cat 2.json | jq '.[2]'
  29. null
  30. # 倒数第一个
  31. jq-test|⇒ cat 2.json | jq '.[-1]'
  32. {
  33.   "name": "XML",
  34.   "good": false
  35. }
  36. jq-test|⇒ cat 2.json | jq '.[-2]'
  37. {
  38.   "name": "JSON",
  39.   "good": true
  40. }
  42. 切片：
  43. jq-test|⇒ echo '["a","b","c","d","e"]' | jq '.[2:4]'
  44. [
  45.   "c",
  46.   "d"
  47. ]
  48. jq-test|⇒ echo '["a","b","c","d","e"]' | jq '.[:4]'
  49. [
  50.   "a",
  51.   "b",
  52.   "c",
  53.   "d"
  54. ]
  55. jq-test|⇒ echo '["a","b","c","d","e"]' | jq '.[-2:]'
  56. [
  57.   "d",
  58.   "e"
  59. ]
  61. jq-test|⇒ echo '"abcdefghi"' | jq '.[2:4]'
  62. "cd"
  64. # 返回所有的value
  65. jq-test|⇒ cat test.json
  66. {"foo": 42, "bar": "less interesting data","42":12}
  67. jq-test|⇒ cat test.json | jq '.[]'
  68. 42
  69. "less interesting data"
  70. 12