[英]Using jq to extract specific property values and output on a single line
我有这个ElasticSearch快照输出,并希望减少它以在一行上从每个snapshot
打印end_time_in_millis
和snapshot
属性的值以空格分隔:
1429609790767 snapshot_1
1429681169896 snapshot_2
基本上是输出
cat data | jq '.snapshots[].end_time_in_millis'
cat data | jq '.snapshots[].end_time_in_millis'
和 cat data | jq '.snapshots[].snapshot'
但在一条线上合并。
我正在看map
但无法弄清楚如何应用它; 我也试过这个答案 :
cat data | jq '.snapshots[] | map(. |= with_entries( select( .key == ( "snapshot") ) ) )'
但是这会产生大量错误和null
输出。
数据:
{
"snapshots": [
{
"shards": {
"successful": 1,
"failed": 0,
"total": 1
},
"failures": [],
"snapshot": "snapshot_1",
"indices": [
"myindex1"
],
"state": "SUCCESS",
"start_time": "2015-04-21T09:45:47.041Z",
"start_time_in_millis": 1429609547041,
"end_time": "2015-04-21T09:49:50.767Z",
"end_time_in_millis": 1429609790767,
"duration_in_millis": 243726
},
{
"shards": {
"successful": 1,
"failed": 0,
"total": 1
},
"failures": [],
"snapshot": "snapshot_2",
"indices": [
"myindex1"
],
"state": "SUCCESS",
"start_time": "2015-04-22T05:36:02.333Z",
"start_time_in_millis": 1429680962333,
"end_time": "2015-04-22T05:39:29.896Z",
"end_time_in_millis": 1429681169896,
"duration_in_millis": 207563
}
]
}
使用此过滤器:
.snapshots[] | "\(.end_time_in_millis) \(.snapshot)"
这会为每个快照构建一个字符串,其中包含结束时间和快照名称。
只需确保使用-r
选项获取原始输出。
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