@finner I'm not sure this can be done with grep. The first issue is that your selected regex flavor on regex101 is "PCRE2", but grep uses ... well, grep-flavored regexes by default (also known as "POSIX basic" regexes). grep does not directly support look-behind, non-greedy quantifiers, \N, or the s flag. The second issue is that grep matches each line separately, so it will never find a match that spans multiple lines.

The first issue could be mitigated if you're using GNU grep, which has a -P switch to enable PCRE2 support, but I don't see how to get past the second issue.

@finner Here's a solution using perl instead:

perl -wlne 'if (m{/wifi} ... m{^/}) { print $1 if /\bPowered = (\S+)/ }'

(Translation to awk is left as an exercise for the reader.)

#perl #awk

@barubary @finner for an #awk version:

awk '/^\//{s=0}/wifi$/{s=1}s && $1=="Powered"{print $NF; exit}'

(if there's more than one wifi device and you want *all* of the Powered= values rather than just the first wifi device, you can remove the "; exit")

@gumnos @barubary

Thanks, I'm going to play around with some of these suggestions later and see which I think works best for me.

Awk is another utility that I've only looked at briefly before and do not have a lot of experience with. I love how when you start learning some of these *nix utilities there are so many things you're about to do so easily when you get good with them.

I really should have built better awk and regex skills a long time ago.