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  • Ah, nice! I was hoping someone could come up with something better than that monstrosity I posted. You could just pass the output through perl -pe 's/([a-zA-Z]+)/\u$1/g; to get the capitalization as the OP had it. Commented Sep 10, 2024 at 19:49
  • Thank you, this is elegant. Since I asked to avoid any additional tools, I've accepted @StéphaneChazelas suggestion as answer below. However, I think I will be using this one regardless :-) On a side note, I thought it would be good to add the interface to the output, which can be achieved by using ip -j a | jq 'foreach .[] as $item (0; . +1; $item.addr_info [] as $a | {ifname: $item.ifname} * $a)' | mlr --j2p unsparsify Commented Sep 11, 2024 at 7:29
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    @hanjo Don't do explicit counting loop when you don't need to: .[] | .ifname as $ifname | .addr_info | map(.ifname=$ifname) | flatten. If you want the ifname field first in the result, then reorder with mlr: mlr --j2p unsparsify then reorder -f ifname Commented Sep 11, 2024 at 7:40
  • @Kusalananda good to know, thanks. Still learning here. On my test machine (Raspberry Pi Model B Rev 2) avoiding the foreach saved 3ms, so I guess the performance advantage is neglectable for this specific use case, but I get the idea. Don't use loops if not absolutely required. Commented Sep 11, 2024 at 7:49
  • @hanjo Well, :-), I hope the millisecond performance gain makes up for the time spent working on the script... Commented Sep 11, 2024 at 7:52