Various commands.

Disk Space

df -h

Lists all partitions and their disk usage

du -hs directoryname/

Returns the total size of everything inside directoryname

sudo du -cha -d 1 /directoryname | sort -nr | head -20

Lists the size of all subdirectories of directoryname

Download Videos

youtube-dl -f 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best' video_URL

Downloading a video in best quality

youtube-dl -x --audio-format mp3 video_URL

Download audio only

String Manipulations

sed -i "s/$OLD/$NEW/g" *.txt

Replace string in multiple files

for file in *; do mv "$file" echo $file | tr ' ' '_' | tr '[:upper:]' '[:lower:]'; done

Change all filenames to lowercase and replace all spaces with underscores in a directory:

xclip -selection clipboard -t image/png -i example.png

Copy an image to the clipboard

Time

date --date='TZ="Continent/City" localTZTime Date/Day'

Print local time of a date and time in a different timezone

tzselect

Find the available timezones

Miscellaneous

command | more

Paging long-scrolling output

whereis applicationname

Find the location of an application

trash-restore filename

Restoring deleted files

pdfunite file01.pdf file02.pdf output.pdf

Combine two pdfs to one

for f in *.zip; do unzip "$f" -d "${f%.zip}"; done

Extract all .zip files in folder creating a new director with the name of the file for each

Debian Packages

Install .deb files

sudo dpkg --install packagename.deb

List installed dpkg packages sorted by size

dpkg-query --show --showformat='${Package;-50}\t${Installed-Size}\n' | sort -k 2 -n | grep -v deinstall | awk '{printf "%.3f MB \t %s\n", $2/(1024), $1}'

Clearing System Logs

journalctl --disk-usage

journalctl --rotate

sudo journalctl --vacuum-files=5

Set SystemMaxUse=100M in /etc/systemd/journald.conf to limit maximum journaling space.

Use systemctl daemon-reload to update.

For printing commands, see printer.

chmod

_{Permission control on who can access files, search directories and run scripts.}

cmus

_{A command line music player.}

feh

_{Simple image viewer}

ffmpeg

_{Commonly used commands to edit videos.}

firefox

_{A complex beast.}

gemini

_{A simple protocol for serving content over the internet.}

git

_{Notes on the version control system}

imagemagick

_{Commmonly used imagemagick commands.}

launcher

_{How to add any file to the application launcher.}

neomutt

_{A command line based e-mail client}

micro

_{A terminal based text editor.}

mime

_{Handling mime types.}

pass

_{A command line password manager.}

resilio sync

_{Peer to peer file syncing}

rsync

_{Battle tested file synchronisation.}

stardict

_{A command line dictionary.}

tarballs

_{A container archive.}

w3m

_{Notes on the command line browser.}

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