Unable to index array

[s-pravin]

I have a sample YAML file with following content:

status:
  interfaces:
  - deviceID: "A2A0"
    name: CL1
  - deviceID: "A2A0"
    name: CL2
  - deviceID: 123d
    name: CL33
  - deviceID: 123d
    name: CL34

Trying to get first occurrence of name with a given deviceID. Using the following command:
yq '.status.interfaces[] | select(.deviceID == "123d") | [.name] | .[0]' sample.yaml
outputs

CL33
CL34

My expectation is that it shall output array index 0 i.e. CL33. Can you please help me understand what am I missing?

Thanks

[s-pravin]

Any suggestions?

[mikefarah]

You were very close:

yq '.status.interfaces[] | select(.deviceID == "123d") | .name' file.yaml

[s-pravin]

Here's the output I get:

$ yq '.status.interfaces[] | select(.deviceID == "123d") | .name' file.yaml
CL33
CL34

I would like to get CL33 as output.

[mikefarah]

Oh my apologies:

yq '[.status.interfaces[] | select(.deviceID == "123d")][0] | .name' file.yaml

Basically after splatting the array with [] you need to put the matches back into an array by surrounding the expression with [ ... ] - then you can index the first one.

[s-pravin]

Thanks Mike!!!