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errnoからお手軽にエラーメッセージを知りたい

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それPerlで出来るよ:

% perl -E 'say$!=24' # errno=24 の場合
Too many open files

覚えたくない人向けのalias:

% alias errno='perl -E "say\$!=\$ARGV[0]"'
% errno 24
Too many open files

便利

解説

別途記事を書きました: https://techblog.karupas.org/entry/2019/05/28/085710
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