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I am trying to replace a value for key ipAddress using sed for the below yaml block:

networkInterfaces: - network: id: network-1111 ipAddress: 192.168.0.0

The command I tried: sed -i 's/\(.*ipAddress:.*\)/ipAddress: 192.168.0.1/g' filename.yaml

This actually replaced the text, but it didn't nest the key under networkInterfaces; instead, it placed it in the main block.

Output after SED

networkInterfaces: - network: id: network-1834 ipAddress: 192.168.0.1

I tried yq

yq -i '.networkInterfaces.ipAddress = "192.168.0.0"' filename.yaml

... that resulted in an error:

cannot index array with 'ipAddress' (strconv.ParseInt: parsing "ipAddress": invalid syntax)

I'm looking to replace the value for ipAddress.

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  • FYI the reason why the key didn't remain nested with sed in this case is because you consumed the leading whitespace as you used .* before the key but then you replaced with string of ip.... If you remove the leading .* it does work as intended. Commented Aug 12, 2024 at 0:45

1 Answer 1

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This answer assumes that you are using Mike Farah's yq utility (which you are, according to the error message you are showing). Andrey Kislyuk's yq is slightly different.

networkInterfaces is a list, so you can't access network or ipAddress beneath it without picking what list element to access these in.

If you only have the single element, you could use

yq '.networkInterfaces[0].network.ipAddress = "192.168.0.1"' file

That is, set the ipAddress of the network of the first element of the networkInterfaces list to the string 192.168.0.1.

To set the ipAddress of an entry with a particular id:

yq '.networkInterfaces[] |= select(.network.id == "network-1111").network.ipAddress = "192.168.0.1"' file

To use shell variables to hold the query id and the new IP number:

id=network-1111 newip=192.168.0.1 yq '.networkInterfaces[] |= select(.network.id == env(id)).network.ipAddress = env(newip)' file
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  • Although this solution works, note that yq may remove blank lines as well as remove line breaks in multi-line text scalars in the YAML file it writes. The former issue has a few work-arounds, but the latter left me stuck without any good work-arounds (back to sed, I guess)? Commented Jun 24, 2024 at 13:55

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