Convert a web page to markdown 1curl -sL "${url}" | html2markdown > "${file}}".md The html2markdown and html2md programs works better than any other.

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Find out what's using the bandwidth 1sudo iftop Press h to see the options.

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Run commands in background 1ls -Rilt ~ & 2jobs 3find ~/.cache/ -type d -exec du '{}' -h ';' | sort -h & 4jobs Stop background command having output 1disown The command will continue as it was. You can see it with top.

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See what the computer is doing 1journalctl -f Check your own user services: 1journalctl -f Follow the ssh daemon service 1journalctl -f -u sshd Find service errors in systemd since a date 1date=2027-01-01 2journalctl --since=${date} --grep="EXT4-fs error" Limit the systemd's journal size to 2 gigabytes 1journalctl …

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Check current keyboard layout on sway 1swaymsg -t get_inputs --raw | jq -r '.[0].xkb_active_layout_name' Show name of currently selected app in sway 1swaymsg -t get_tree | jq -C '.. | select(.type?) | select(.focused==true)'

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Turn markdown into a man page 1man <(lowdown -stman ${file}.md) Live web build from a markdown file 1lowdown ${file}.md -m 'htmlheader: <meta http-equiv="refresh" content="3">'${file}.html This tells the output to refresh every three seconds.

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Convert jpg to png 1magick ${input}.jpg ${output}.png Reduce jpg size by reducing quality 1quality=70 2magick ${input}.jpg -quality ${quality} ${output}.jpg Reduce png size 1magick ${input}.png png8:${output}.png Invert jpg colours 1magick ${input}.jpg ${output}.jpg -negate Make jpg smaller 1magick ${input}.jpg -resize …

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Turn markdown into a man page 1man <(lowdown -stman ${file}.md)

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Convert markdown table to csv 1mlr --imarkdown --ocsv cat ${file}.md Convert a csv file to markdown 1mlr --icsv --omd cat ${file}.csv

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Hard reset ntp service 1sudo ntpd -q -g -x -n

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