我运行 aaws rds describe-instances并json或多或少地得到了一个实例数组，如下所示：
"DBInstances": [
{
"DBInstanceIdentifier": "my-rds",
"Endpoint": {
"HostedZoneId": "XXXXXXXXXXXX"
},
"DBSecurityGroups": [],
"VpcSecurityGroups": [
{
"VpcSecurityGroupId": "sg-12345",
"Status": "active"
},
{
"VpcSecurityGroupId": "sg-12345",
"Status": "active"
}
],
"DBParameterGroups": [
{
"DBParameterGroupName": "postgres-12",
"ParameterApplyStatus": "in-sync"
}
],
"AvailabilityZone": "us-west-1c",
"DBSubnetGroup": {
"VpcId": "vpc-123456",
"SubnetGroupStatus": "Complete",
"Subnets": [
{
"SubnetIdentifier": "subnet-123456",
"SubnetAvailabilityZone": {
"Name": "us-west-1b"
},
"SubnetOutpost": {},
"SubnetStatus": "Active"
},
{
"SubnetIdentifier": "subnet-12345",
"SubnetAvailabilityZone": {
"Name": "us-west-1c"
},
"SubnetOutpost": {},
"SubnetStatus": "Active"
},
{
"SubnetIdentifier": "subnet-12345",
"SubnetAvailabilityZone": {
"Name": "us-west-1e"
},
"SubnetOutpost": {},
"SubnetStatus": "Active"
}
]
},
"EngineVersion": "11.9",
"AutoMinorVersionUpgrade": true,
"ReadReplicaDBInstanceIdentifiers": [],
"LicenseModel": "foobar",
"OptionGroupMemberships": [
{
"OptionGroupName": "randomname",
"Status": "in-sync"
}
],
},
}
输出明显截断。
有没有办法使用（jq可能？）打印：
a)DBInstances数组的所有元素
并且只为每个元素打印
b)DBInstanceIdentifier和EngineVersion?
您可以使用以下 JQ 过滤器：
.DBInstances[] | [ .DBInstanceIdentifier, .EngineVersion ]
在哪里
.DBInstances[]在DBInstances数组上循环[ .DBInstanceIdentifier, .EngineVersion ]创建一个只包含DBInstanceIdentifier和EngineVersion键的数组jq '.DBInstances[] | [ .DBInstanceIdentifier, .EngineVersion ]'
从您当前的 JSON 示例（DBInstances数组中只有 1 个项目）开始，结果是：
[
"my-rds",
"11.9"
]
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