使用query参数过滤组合AWS CLI输出信息

通常在使用CLI进行操作的时候，会输出很长一串json或表格文本在命令行端。

为了从这个输出信息中过滤出需要的信息，可能会用filter命令或者sed，grep，awk来处理。

AWS CLI本身支持query命令来使用复杂的语法来使用条件判断，过滤出需要的字段。

query本身的语法信息是通过JMESPath（http://jmespath.readthedocs.org/en/latest/specification.html）来定义的。

例如，普通使用“ aws devicefarm list-devices --region us-west-2”命令会输出形如

{
"devices": [
{
"formFactor": "TABLET",
"name": "Apple iPad Mini 2",
"resolution": {
"width": 1536,
"height": 2048
},
"image": "NA",
"platform": "IOS",
"heapSize": 0,
"memory": 17179869184,
"model": "iPad Mini 2",
"os": "7.1.2",
"cpu": {
"frequency": "MHz",
"architecture": "ARMv8 (A32, A64)",
"clock": 1400.0
},
"arn": "arn:aws:devicefarm:us-west-2::device:3B33A0062E6D47B4A50437C48F9141F6",
"manufacturer": "Apple"
},
{
"formFactor": "TABLET",
"name": "Apple iPod Touch 5th Gen",
"resolution": {
"width": 640,
"height": 1136
},
"image": "NA",
"platform": "IOS",
"heapSize": 0,
"memory": 68719476736,
"model": "iPod Touch 5th Gen",
"os": "8.1.2",
"cpu": {
"frequency": "MHz",
"architecture": "ARMv7",
"clock": 1200.0
},
"arn": "arn:aws:devicefarm:us-west-2::device:8BF08BA1178D4DF7B46AB882A62FFD68",
"manufacturer": "Apple"
},
。。。
]
}

如果我们想找manufacturer是Apple的设备信息，可以使用

aws devicefarm list-devices --region us-west-2 --query 'devices[?manufacturer==`Apple`]'

注意，这里的Apple是用反引号应用的，不是单引号，也不是双引号

输出

[
{
"formFactor": "TABLET",
"name": "Apple iPad Mini 2",
"resolution": {
"width": 1536,
"height": 2048
},
"image": "NA",
"platform": "IOS",
"heapSize": 0,
"memory": 17179869184,
"model": "iPad Mini 2",
"os": "7.1.2",
"cpu": {
"frequency": "MHz",
"architecture": "ARMv8 (A32, A64)",
"clock": 1400.0
},
"arn": "arn:aws:devicefarm:us-west-2::device:3B33A0062E6D47B4A50437C48F9141F6",
"manufacturer": "Apple"
},
{
"formFactor": "TABLET",
"name": "Apple iPod Touch 5th Gen",
"resolution": {
"width": 640,
"height": 1136
},
"image": "NA",
"platform": "IOS",
"heapSize": 0,
"memory": 68719476736,
"model": "iPod Touch 5th Gen",
"os": "8.1.2",
"cpu": {
"frequency": "MHz",
"architecture": "ARMv7",
"clock": 1200.0
},
"arn": "arn:aws:devicefarm:us-west-2::device:8BF08BA1178D4DF7B46AB882A62FFD68",
"manufacturer": "Apple"
},

可以挑选一些参数来输出

aws devicefarm list-devices --region us-west-2 --query 'devices[?manufacturer==`Apple`].[name,resolution.width,resolution.height,os]'

注意，这4个参数是用方括号包围起来的。

[
[
"Apple iPad Mini 2",
1536,
2048,
"7.1.2"
],
[
"Apple iPod Touch 5th Gen",
640,
1136,
"8.1.2"
],
[
"Apple iPhone 5c",
640,
1136,
"8.0.2"
],
[
"Apple iPad Mini 1st Gen",
768,
1024,
"7.1.2"
],

使用

--output table

参数后，表格显示得就更易读了
aws devicefarm list-devices --region us-west-2 --query 'devices[?manufacturer==`Apple`].[name,resolution.width,resolution.height,os]' --output table

-------------------------------------------------------
|                     ListDevices                     |
+---------------------------+-------+-------+---------+
|  Apple iPad Mini 2        |  1536 |  2048 |  7.1.2  |
|  Apple iPod Touch 5th Gen |  640  |  1136 |  8.1.2  |
|  Apple iPhone 5c          |  640  |  1136 |  8.0.2  |
|  Apple iPad Mini 1st Gen  |  768  |  1024 |  7.1.2  |
|  Apple iPhone 6           |  750  |  1334 |  8.3    |
|  Apple iPhone 6 Plus      |  1080 |  1920 |  8.1    |
|  Apple iPhone 6           |  750  |  1334 |  8.4    |
|  Apple iPad Air           |  1536 |  2048 |  8.0    |
|  Apple iPhone 5           |  640  |  1136 |  8.1.1  |
|  Apple iPad Mini 1st Gen  |  768  |  1024 |  8.4    |
|  Apple iPhone 5           |  640  |  1136 |  8.3    |
|  Apple iPhone 5c          |  640  |  1136 |  8.3    |
|  Apple iPhone 5           |  640  |  1136 |  8.0    |
|  Apple iPhone 5s          |  640  |  1136 |  7.1.2  |

或者把输出信息使用json的map形式

aws devicefarm list-devices --region us-west-2 --query 'devices[?manufacturer==`Apple`].{name:name,width:resolution.width,height:resolution.height,os:os}'

注意命令行后面部分的大括号

输出

[
{
"width": 1536,
"os": "7.1.2",
"name": "Apple iPad Mini 2",
"height": 2048
},
{
"width": 640,
"os": "8.1.2",
"name": "Apple iPod Touch 5th Gen",
"height": 1136
},
{
"width": 640,
"os": "8.0.2",
"name": "Apple iPhone 5c",
"height": 1136
},