Stand up every 20 minutes (mac os)

Foreword : Inspired by excellent post

Initial task: creating notification every 20 minutes can be decomposed into two parts:
1. create notification
2. scheduled launch

First subtask can be solved using this trivial script.

standup.sh:

#!/bin/sh

# stand up notification

osascript -e 'display notification "Stand up" with title "Healthy programmer"'

say "Stand up"

Second subtask (scheduled launch) can be solved using: daemon and agent mechanism.

Create file: com.example.stand.up.plist and place it into ~/Library/LaunchAgents/.

com.example.stand.up.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>Label</key>
  <string>com.example.stand.up</string>

  <key>ProgramArguments</key>
  <array>
    <string>sh</string>
    <string>-c</string>
    <string>**PATH_TO_STAND_UP_SCRIPT_DESCRIBED_ABOVE**"</string>
  </array>

  <key>StartInterval</key>
  <integer>1200</integer>

  <key>ExitTimeOut</key>
  <integer>0</integer>

  <key>ProcessType</key>
  <string>Standard</string>
</dict>
</plist>

To start using this file (add to scheduler):

launchctl load ~/Library/LaunchAgents/com.example.start.up.plist

To stop using this file (remove from scheduler):

launchctl unload ~/Library/LaunchAgents/com.example.start.up.plist

To list scheduled tasks

launchctl list

After reboot this file com.example.start.up.plist will be used automatically.