[Linux] Linux使用终端工具给你的电脑发送弹窗提醒！

$ sudo dnf install notify-send

$ sudo apt install notify-send

$ notify-send "liangxu is great!!" 
$ notify-send "welcome to liangxu's website" "www.lxlinux.net"

$ notify-send -u critical \ 
  "Build failed!" \ 
  "There were <b>123</b> errors. Click here to see the results: http://buildserver/latest"

$ at 12:00

$ echo "npm run build" | at now + 1 minute 
$ echo "backup-db" | at 13:00

• 绝对时间，例如 10:00
  
• 相对时间，例如 now + 2 hours
  
• 特殊时间，例如 noon 或 midnight
  

$ echo "notify-send 'Stop it and go home now?' 'Enough work for today.' -u critical" | at now

$ remind "I'm still here" now 
$ remind "Time to wake up!" in 5 minutes 
$ remind "Dinner" in 1 hour 
$ remind "Take a break" at noon 
$ remind "It's Friday pints time!" at 17:00

$ source ~/bin/remind

#!/usr/bin/env bash 
function remind () { 
  local COUNT="$#" 
  local COMMAND="$1" 
  local MESSAGE="$1" 
  local OP="$2" 
  shift 2 
  local WHEN="$@" 
  # Display help if no parameters or help command 
  if [[ $COUNT -eq 0 || "$COMMAND" == "help" || "$COMMAND" == "--help" || "$COMMAND" == "-h" ]]; then 
  echo "COMMAND" 
  echo "  remind <message> <time>" 
  echo "  remind <command>" 
  echo 
  echo "DESCRIPTION" 
  echo "  Displays notification at specified time" 
  echo 
  echo "EXAMPLES" 
  echo '  remind "Hi there" now' 
  echo '  remind "Time to wake up" in 5 minutes' 
  echo '  remind "Dinner" in 1 hour' 
  echo '  remind "Take a break" at noon' 
  echo '  remind "Are you ready?" at 13:00' 
  echo '  remind list' 
  echo '  remind clear' 
  echo '  remind help' 
  echo 
  return 
  fi 
  # Check presence of AT command 
  if ! which at >/dev/null; then 
  echo "remind: AT utility is required but not installed on your system. Install it with your package manager of choice, for example 'sudo apt install at'." 
  return 
  fi 
  # Run commands: list, clear 
  if [[ $COUNT -eq 1 ]]; then 
  if [[ "$COMMAND" == "list" ]]; then 
    at -l 
  elif [[ "$COMMAND" == "clear" ]]; then 
    at -r $(atq | cut -f1) 
  else 
    echo "remind: unknown command $COMMAND. Type 'remind' without any parameters to see syntax." 
  fi 
  return 
  fi 
  # Determine time of notification 
  if [[ "$OP" == "in" ]]; then 
  local TIME="now + $WHEN" 
  elif [[ "$OP" == "at" ]]; then 
  local TIME="$WHEN" 
  elif [[ "$OP" == "now" ]]; then 
  local TIME="now" 
  else 
  echo "remind: invalid time operator $OP" 
  return 
  fi 
  # Schedule the notification 
  echo "notify-send '$MESSAGE' 'Reminder' -u critical" | at $TIME 2>/dev/null 
  echo "Notification scheduled at $TIME" 
}