Some useful shell commands (including macOS specialized)

commands.sh

# Current weather and forecast
curl http://wttr.in/

# ASCII Star Wars
nc towel.blinkenlights.nl 23
# or
telnet towel.blinkenlights.nl

# Turn off Mac’s startup sound
sudo nvram SystemAudioVolume=%80

# Create DMG
hdiutil create -srcfolder ./Source\ Directory -fs HFS+ -volname "Some DMG" ./Destinating\ Image\ File.dmg -ov

# Recursively find and remove all SCSS files in current directory
find . -name "*.scss" -exec rm -f {} \;

# Hide directory
chflags hidden /path/to/directory

# Show directory
chflags nohidden /path/to/directory

# Create file with size
mkfile 1g foo.bar

# Download some file with curl
curl -O https://get.videolan.org/vlc/3.0.3/macosx/vlc-3.0.3.dmg


# Defaults
## Disallow HelpViewer window be always on the top of other windows
defaults write com.apple.helpviewer DevMode -bool true

## Switch to the single application mode
defaults write com.apple.dock single-app -bool true; killall Dock

## Make widgets unpinned from Dashboard — just drag a widget (you should relogin after running the command)
defaults write com.apple.dashboard devmode YES

## Make Quick Look preview window text selectable
defaults write com.apple.finder QLEnableTextSelection -bool TRUE; killall Finder

## Show hidden files in Finder
defaults write com.apple.finder AppleShowAllFiles -boolean true; killall Finder

## Do not sleep when press power button
defaults write com.apple.loginwindow PowerButtonSleepsSystem -bool no

## Disable shadows of screenshots
defaults write com.apple.screencapture disable-shadow -bool TRUE && killall SystemUIServer

## Enable shadows of screenshots
defaults write com.apple.screencapture disable-shadow -bool FALSE && killall SystemUIServer

## Change default screenshots directory
defaults write com.apple.screencapture location /path/to/directory && killall SystemUIServer

## Change dock show/hide animation duration (in seconds)
defaults write com.apple.dock autohide-time-modifier -float 0.5 && killall Dock

## Add note to login screen
sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Your message here"

## Remove note from login screen
sudo defaults delete /Library/Preferences/com.apple.loginwindow

## Force enable AptX codec using via bluetooth
sudo defaults write bluetoothaudiod "Enable AptX codec" -bool true

## Enable sound when connects a power
defaults write com.apple.PowerChime ChimeOnAllHardware -bool TRUE; open /System/Library/CoreServices/PowerChime.app &
## Disable sound when connects a power
defaults write com.apple.PowerChime ChimeOnAllHardware -bool FALSE; killall PowerChime


# Git:
## Edit last commit
git commit --amend

## Show some lost (by user) files
git show $(git fsck --no-reflog | awk '/dangling commit/ {print $3}')


# FFMPEG
## Converts MP4-video to GIF (common palette)
ffmpeg -i in.mp4 -filter_complex "[0:v] fps=12,split [a][b];[a] palettegen [p];[b][p] paletteuse" out.gif

## Converts MP4-video to GIF (individual palette for each frame)
ffmpeg -i in.mp4 -filter_complex "[0:v] fps=12,split [a][b];[a] palettegen=stats_mode=single [p];[b][p] paletteuse=new=1" out.gif