Shell scripts to trigger custom macOS Notifications using osascript | https://swissmacuser.ch/native-macos-notifications-from-terminal-scripts/

command-oneliner-a.sh

osascript -e "display notification \"This notification comes straight from Terminal.app to your macOS Notification Center, thanks to AppleScript 🤓\""

command-oneliner-b.sh

osascript -e "display notification \"This notification comes straight from Terminal.app to your macOS Notification Center, thanks to AppleScript 🤓\" with title \"My Custom Notification\""

command-oneliner-c.sh

osascript -e "display notification \"This notification comes straight from Terminal.app to your macOS Notification Center, thanks to AppleScript 🤓\" with title \"My Custom Notification\" subtitle \"I love scripting\""

notification-script.sh

#!/usr/bin/env zsh

# Instructions:
# - Make this file executable first using `chmod +x notification-script.sh`
# - Run it from Terminal.app using: ./notification-script.sh "This is a notification"
# Learn more: https://swissmacuser.ch/native-macos-notifications-from-terminal-scripts/

# Function to send a Notification to get attention for the Script
function notify(){
    local title="$2"
    local text="$1"
    /usr/bin/osascript -e "display notification \"$text\" with title \"$title\""
    # Or with a subtitle, but note, this truncates Notification texts with too many characters!
    #local subtitle="Terminal.app"
    #/usr/bin/osascript -e "display notification \"$text\" with title \"$title\" subtitle \"$subtitle\""
}

# Check for user input and trigger Notification
if [ -n "$1" ]; then
    notify "$1" "$0"
    # exit OK
    exit 0
else
    echo -e "Usage: $0 \"This is a custom text\""
    # exit with error:
    exit 1
fi