我试图使用jq从json文档中获取属性。我想获得具有特定名称的最新快照。这是bash中的jq语句,在我添加select with filter
之前一直正常工作snapid=aws redshift describe-cluster-snapshots --region us-west-2 | jq'.[] | select(.ClusterIdentifier=="dev-cluster") | max_by(.SnapshotCreateTime) | .SnapshotIdentifier'
这是我从中抽出的json doc。有多个快照条目,但这是我的目标。
{
"Snapshots": [
{
"EstimatedSecondsToCompletion": 0,
"OwnerAccount": "45645641155",
"CurrentBackupRateInMegaBytesPerSecond": 6.2857,
"ActualIncrementalBackupSizeInMegaBytes": 22.0,
"NumberOfNodes": 3,
"Status": "available",
"VpcId": "myvpc",
"ClusterVersion": "1.0",
"Tags": [],
"MasterUsername": "ayxbizops",
"TotalBackupSizeInMegaBytes": 192959.0,
"DBName": "dev",
"BackupProgressInMegaBytes": 22.0,
"ClusterCreateTime": "2016-09-06T15:56:08.170Z",
"RestorableNodeTypes": [
"dc1.large"
],
"EncryptedWithHSM": false,
"ClusterIdentifier": "dev-cluster",
"SnapshotCreateTime": "2016-09-06T16:00:25.595Z",
"AvailabilityZone": "us-west-2c",
"NodeType": "dc1.large",
"Encrypted": false,
"ElapsedTimeInSeconds": 3,
"SnapshotType": "manual",
"Port": 5439,
"SnapshotIdentifier": "thismorning"
}
]
}
我收到错误,无法使用字符串索引数组" ClusterIdentifier"。
答案 0 :(得分:0)
这个怎么样?
jq '.[]|map(select(.ClusterIdentifier=="dev-cluster"))
|max_by(.SnapshotCreateTime)|.SnapshotIdentifier'