I had forgotten about it but will try to remember as it’s nicer than moving mouse and focus like @DevotionGeo said. Though now that I am back in Emacs, it’s more likely to be M-x calendar For the same reason. 
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The usual Unix/Linux cli tools: ls, cd, sort, grep, vim, nohup, ps ax.
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jq when curling.
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Several years ago I wrote something about command line tools.
Recently I tried fig, it looks quite fancy. However, I still prefer zsh-completions
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