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Launch a "Getting Started" workflow
gcloud init
Launch a workflow without diagnostics
gcloud init --skip-diagnostics
Use the console for authentication
gcloud init --console-only
Disable a configuration file
sudo a2disconf configuration_file
Don't show informative messages
sudo a2disconf --quiet configuration_file
Open one or more files in read-only mode
libreoffice --view path/to/file1 path/to/file2 ...
Display the content of one or more files
libreoffice --cat path/to/file1 path/to/file2 ...
Print files using a specific printer
libreoffice --pt printer_name path/to/file1 path/to/file2 ...
Convert all `.doc` files in current directory to PDF
libreoffice --convert-to pdf *.doc
Display the [s]tatus of the audit system
sudo auditctl -s
[l]ist all currently loaded audit rules
sudo auditctl -l
[D]elete all audit rules
sudo auditctl -D
[e]nable/disable the audit system
sudo auditctl -e 1|0
Watch a file for changes
sudo auditctl -a always,exit -F arch=b64 -F path=/path/to/file -F perm=wa
Recursively watch a directory for changes
sudo auditctl -a always,exit -F arch=b64 -F dir=/path/to/directory/ -F perm=wa
Display [h]elp
auditctl -h
View documentation for the current command
tldr pamcomp
Delete an empty S3 bucket
aws s3 rb s3://bucket_name
Force delete an S3 bucket and its non-versioned objects (will crash if versioned objects are present)
aws s3 rb s3://bucket_name --force
Show CPU statistics at a 2 second interval for 10 times
pidstat 2 10
Show page faults and memory utilization
pidstat -r
Show input/output usage per process ID
pidstat -d
Show information on a specific PID
pidstat -p PID
Show memory statistics for all processes whose command name include "fox" or "bird"
pidstat -C "fox|bird" -r -p ALL
Display the names and values of shell variables
set
Export newly initialized variables to child processes
set -a
Write formatted messages to `stderr` when jobs finish
set -b
Write and edit text in the command-line with `vi`-like keybindings (e.g. `yy`)
set -o vi
Return to default mode
set -o emacs
List all modes
set -o
Exit the shell when (some) commands fail
set -e
Create a repository in the local filesystem
kopia repository create filesystem --path path/to/local_repository
Create a repository on Amazon S3
kopia repository create s3 --bucket bucket_name --access-key AWS_access_key_id --secret-access-key AWS_secret_access_key
Connect to a repository
kopia repository connect repository_type --path path/to/repository
Create a snapshot of a directory
kopia snapshot create path/to/directory
List snapshots
kopia snapshot list
Restore a snapshot to a specific directory
kopia snapshot restore snapshot_id path/to/target_directory
Create a new policy
kopia policy set --global --keep-latest number_of_snapshots_to_keep --compression compression_algorithm
Ignore a specific file or folder from backups
kopia policy set --global --add-ignore path/to/file_or_folder
Print the total number of commits
git count
Print the number of commits per contributor and the total number of commits
git count --all
Download a video or playlist
youtube-dl 'https://www.youtube.com/watch?v=oHg5SJYRHA0'
List all formats that a video or playlist is available in
youtube-dl --list-formats 'https://www.youtube.com/watch?v=Mwa0_nE9H7A'
Download a video or playlist at a specific quality
youtube-dl --format "best[height<=480]" 'https://www.youtube.com/watch?v=oHg5SJYRHA0'
Download the audio from a video and convert it to an MP3
youtube-dl -x --audio-format mp3 'url'
Download the best quality audio and video and merge them
youtube-dl -f bestvideo+bestaudio 'url'
Download video(s) as MP4 files with custom filenames
youtube-dl --format mp4 -o "%(playlist_index)s-%(title)s by %(uploader)s on %(upload_date)s in %(playlist)s.%(ext)s" 'url'
Download a particular language's subtitles along with the video
youtube-dl --sub-lang en --write-sub 'https://www.youtube.com/watch?v=Mwa0_nE9H7A'
Download a playlist and extract MP3s from it
youtube-dl -f "bestaudio" --continue --no-overwrites --ignore-errors --extract-audio --audio-format mp3 -o "%(title)s.%(ext)s" 'url_to_playlist'
Convert an A2 poster into 4 A4 pages
pdfposter --poster-size a2 input_file.pdf output_file.pdf
Scale an A4 poster to A3 and then generate 2 A4 pages
pdfposter --scale 2 input_file.pdf output_file.pdf
View documentation for the current command
tldr pamtotiff
Start a snake game
snake4
Choose level
1|2|3|4|5
Navigate the snake
Up|Down|Left|Right arrow key
Pause game
<Spacebar>
Quit game
q
Show the high scores
snake4 --highscores
Calculate the checksum for a file using a specific algorithm
xxhsum -H0|32|64|128 path/to/file
Run benchmark
xxhsum -b
List available runtimes for a web application
az webapp list-runtimes --os-type windows|linux
Create a web application
az webapp up --name name --location location --runtime runtime
List all web applications
az webapp list
Delete a specific web application
az webapp delete --name name --resource-group resource_group
Speak a phrase aloud
espeak "I like to ride my bike."
Speak a file aloud
espeak -f path/to/file
Save output to a WAV audio file, rather than speaking it directly
espeak -w filename.wav "It's GNU plus Linux"
Use a different voice
espeak -v voice
Initialize the `pacman` keyring
sudo pacman-key --init
Add the default Arch Linux keys
sudo pacman-key --populate archlinux
List keys from the public keyring
pacman-key --list-keys
Add the specified keys
sudo pacman-key --add path/to/keyfile.gpg
Receive a key from a key server
sudo pacman-key --recv-keys "uid|name|email"
Print the fingerprint of a specific key
pacman-key --finger "uid|name|email"
Sign an imported key locally
sudo pacman-key --lsign-key "uid|name|email"
Remove a specific key
sudo pacman-key --delete "uid|name|email"
Search block devices by filesystem label
findfs LABEL=label
Search by filesystem UUID
findfs UUID=uuid
Search by partition label (GPT or MAC partition table)
findfs PARTLABEL=partition_label
Search by partition UUID (GPT partition table only)
findfs PARTUUID=partition_uuid
Open a file
helix path/to/file
Open files and show them one next each other
helix --vsplit path/to/file1 path/to/file2
Show the tutorial to learn Helix (or access it within Helix by pressing `<Esc>` and typing `:tutor`)
helix --tutor
Change the Helix theme
:theme theme_name
Save and Quit
:wq<Enter>
Force-quit without saving
:q!<Enter>
Undo the last operation
u
Search for a pattern in the file (press `n`/`N` to go to next/previous match)
/search_pattern<Enter>
View documentation for the original command
tldr xzgrep
Shift the lines in the input image by a randomized amount not exceeding s to the left or to the right
ppmshift s path/to/input_file.ppm > path/to/output_file.ppm
Run a specific test plan in nongui mode
jmeter --nongui --testfile path/to/file.jmx
Run a test plan in nongui mode using a specific log file
jmeter --nogui --testfile path/to/file.jmx --logfile path/to/logfile.jtl
Run a test plan in nongui mode using a specific proxy
jmeter --nongui --testfile path/to/file.jmx --proxyHost 127.0.0.1 --proxyPort 8888
Run a test plan in nongui mode using a specific JMeter property
jmeter --jmeterproperty key='value' --nongui --testfile path/to/file.jmx
List all known user records
userdbctl user
Show details of a specific user
userdbctl user username
List all known groups
userdbctl group
Show details of a specific group
userdbctl group groupname
List all services currently providing user/group definitions to the system
userdbctl services
Start a REPL (interactive shell)
sbt