awless list alarm --filter --ids weird output

[taraspos]

Hey. I'm using awless to get the arn of some alarm, to do so, I'm filtering alarms by name and getting ids. But getting the next result:

$ awless list alarms --filter Name=TaskFailAlarm --ids
arn:aws:cloudwatch:us-east-1:xxxx:alarm:xxxx-TaskFailAlarm-xxxxx
xxxx-TaskFailAlarm-xxxxx

Somehow instead of getting just Arn, I'm getting the alarm name in the new line as well.

[fxaguessy]

Hello,

The --ids flag in awless list is a shortcut to display all ids and names of resources (perhaps badly named...). It is for example used for completion.

If you want to get only alarms ARNs, you can run:

awless list alarms --columns=id --format=tsv --no-headers

However, for now, --columns= flag is not compatible with --filter= flag on different columns. So you can not directly filter on name and keep only ARNs.

However, as a quick fix you might want to do:

 awless list alarms --filter Name=testalarm --columns=Arn,Name --format=tsv --no-headers | grep "TaskFailAlarm" | cut -f

[simcap]

Errata on the second command line above. It should be --columns=arn and not --columns=id such as:

awless list alarms --columns=arn --format=tsv --no-headers

What is not obvious indeed is that we can select column name (i.e. Arn) that are not visible but part of the awless Alarm object model (i.e. in awless an Alarm has an Arn also it is just not displayed for more clarity).

Also --filter only work on columns that are going to be displayed.

So to complete what @fxaguessy said and to get a one-liner that get the Arn of some alarm filtering on name you can do:

awless ls alarms --columns=arn,name --filter name=TaskFailAlarm --no-headers

I am closing this. Re-open if needed.