AliyunCLI 过滤功能使用说明有哪些

AliyunCLI支持使用filter参数对指令返回的结果进行过滤输出。从开放API调用返回数据, 默认采用Json格式，所以用户在使用AliyunCLI时, 可以根据Json的特点, 使用过滤功能直接获取所需子节点数据。
下面举例说明：

原始数据：

# aliyuncli ecs DescribeImages   --ImageOwnerAlias system --output json --PageSize 1 --PageNumber 1 {       "PageSize": 1,       "RegionId": "cn-hangzhou",       "TotalCount": 39,       "PageNumber": 1,       "RequestId":   "A0F91B21-BD8D-48D9-9EC8-36FB7E1D387E",       "Images": {           "Image": [             {                 "Status":   "Available",                 "ProductCode":   "",                 "Platform":   "Freebsd",                 "Description":   "freebsd1001_64_20G_aliaegis_20150527.vhd",                 "IsCopied": false,                 "Tags": {                     "Tag": []                 },                 "IsSubscribed":   false,                 "IsSelfShared":   "",                 "CreationTime":   "2015-06-19T10:45:56Z",                 "OSName":   "FreeBSD  10.1 64\u4f4d",                   "DiskDeviceMappings": {                     "DiskDeviceMapping":   [                         {                               "Format": "",                               "ImportOSSBucket": "",                               "Device": "/dev/xvda",                               "SnapshotId": "",                             "ImportOSSObject":   "",                             "Size":   "20"                         }                     ]                 },                 "ImageId":   "freebsd1001_64_20G_aliaegis_20150527.vhd",                 "Usage":   "instance",                   "ImageName":   "freebsd1001_64_20G_aliaegis_20150527.vhd",                 "Architecture":   "x86_64",                 "ImageOwnerAlias":   "system",                 "OSType":   "linux",                 "Progress":   "100%",                 "ImageVersion":   "1.0.0",                 "Size": 20             }           ]       } }

用法示例：
l   示例1：指定key值进行过滤，获取对应value
如果通过filter传入的key值是最末节点，则会返回其对应的value。
n   过滤方法示例
只过滤输出返回结果中的TotalCount字段对应值：

# aliyuncli ecs DescribeImages   --ImageOwnerAlias system --output json --PageSize 1 --PageNumber 1 --filter   TotalCount 39

l   示例2：指定key值进行过滤，获取所有子节点数据
如果通过filter传入的key值非最末节点，则会返回其下所有子节点数据。
n   过滤方法示例
过滤输出返回结果中所有Image相关信息：

# aliyuncli ecs DescribeImages   --ImageOwnerAlias system --output json --PageSize 1 --PageNumber 1   --filter Images {       "Image": [           {             "Status":   "Available",             "ProductCode":   "",             "Platform":   "Freebsd",             "Description":   "freebsd1001_64_20G_aliaegis_20150527.vhd",             "IsCopied": false,             "Tags": {                 "Tag": []             },             "IsSubscribed": false,             "IsSelfShared":   "",             "CreationTime":   "2015-06-19T10:45:56Z",             "OSName":   "FreeBSD  10.1 64\u4f4d",             "DiskDeviceMappings": {                   "DiskDeviceMapping": [                     {                         "Format":   "",                           "ImportOSSBucket": "",                         "Device":   "/dev/xvda",                           "SnapshotId": "",                         "ImportOSSObject":   "",                         "Size":   "20"                     }                 ]             },             "ImageId":   "freebsd1001_64_20G_aliaegis_20150527.vhd",             "Usage":   "instance",             "ImageName":   "freebsd1001_64_20G_aliaegis_20150527.vhd",             "Architecture":   "x86_64",             "ImageOwnerAlias":   "system",             "OSType":   "linux",             "Progress":   "100%",             "ImageVersion":   "1.0.0",             "Size": 20           }       ] }

l    示例3：通过数组下标获取返回数组（array）中指定子项值
如果返回结果中包含数组（array）数据，则可以通过filter传入指定序列编号获取相应子项值。
注意：数组下标从0开始计数。
n   过滤方法示例
过滤输出返回结果中第1个Image的所有相关信息：

# aliyuncli ecs DescribeImages   --ImageOwnerAlias system --output json --PageSize 1 --PageNumber 1   --filter Images.Image[0] {       "Status": "Available",       "ProductCode": "",       "Platform": "Freebsd",       "Description":   "freebsd1001_64_20G_aliaegis_20150527.vhd",       "IsCopied": false,       "Tags": {           "Tag": []       },       "IsSubscribed": false,       "IsSelfShared": "",       "CreationTime": "2015-06-19T10:45:56Z",       "OSName": "FreeBSD    10.1 64\u4f4d",       "DiskDeviceMappings": {           "DiskDeviceMapping": [             {                 "Format":   "",                 "ImportOSSBucket": "",                   "Device":   "/dev/xvda",                 "SnapshotId":   "",                 "ImportOSSObject":   "",                 "Size":   "20"             }           ]       },       "ImageId": "freebsd1001_64_20G_aliaegis_20150527.vhd",         "Usage": "instance",       "ImageName":   "freebsd1001_64_20G_aliaegis_20150527.vhd",       "Architecture": "x86_64",       "ImageOwnerAlias": "system",       "OSType": "linux",       "Progress": "100%",       "ImageVersion": "1.0.0",       "Size": 20 }

l   示例4：通过数组下标获取返回数组（array）子项下指定字段对应值
如果返回结果中包含数组（array）数据，则可以通过filter传入指定序列编号和所需字段，获取相应子项下所需字段值。
注意：数组下标从0开始计数。
n   过滤方法示例
过滤输出返回结果中第1个Image的ImageId值：

# aliyuncli ecs DescribeImages   --ImageOwnerAlias system --output json --PageSize 1 --PageNumber 1   --filter Images.Image[0].ImageId "freebsd1001_64_20G_aliaegis_20150527.vhd"

l   示例5：通过*号获取返回数组（array）中所有子项下指定字段对应值
如果返回结果中包含数组（array）数据，则可以通过filter传入*号和所需字段，获取所有子项下所需字段值。
n   过滤方法示例
过滤输出返回结果中所有ImageId值：

# aliyuncli ecs DescribeImages   --ImageOwnerAlias system --output json --PageSize 1 --PageNumber 1   --filter Images.Image[*].ImageId [       "freebsd1001_64_20G_aliaegis_20150527.vhd" ]

l   示例6：嵌套过滤
如果返回结果中包含的数组（array）数据的子节点也是数组，则可以通过嵌套过滤获取所需子项下的所需字段值。
n   过滤方法示例
过滤输出返回结果中指定编号Image的所生成磁盘的Device信息：

# aliyuncli ecs DescribeImages   --ImageOwnerAlias system --output json --PageSize 1 --PageNumber 1 --filter   Images.Image[0].DiskDeviceMappings.DiskDeviceMapping[0].Device "/dev/xvda"

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