TeCoEd (Teaching Computing Education)
  • Home
    • Freelance
    • Book
    • Downloading
  • Python
    • Learn Python >
      • Python Modules
    • PyGame Zero
    • Python Programs >
      • Higher or Lower
      • Magic Calculator
      • Password Checker
      • Python Pit
    • What's News App
    • Pixels to Cells
    • Python Mosaics
    • Python OCR
    • L-1-AM
    • Web Scraping >
      • Scraping Trains
    • Weather App
    • Snakes and Windows
    • Python Web Server >
      • Flask
    • Python Picks
  • Ras Pi
    • All About the Pi
    • Getting Started
    • Remote Desktop and VNC
    • Static IP Address
    • Sonic Pi >
      • 3.14
    • Twitter Feed >
      • Tweepy
    • Android & Pi >
      • Advanced Apps
      • Odds
    • A.I on the the Pi
    • CRON
    • Pick Your Own
  • Pi Hardware
    • Pi HATS >
      • Sense Hat Hacks
      • AstroPi HAT
      • Unicorn-HAT >
        • Unicorn Alphabet Disco
        • Uni Codes / Programs
      • Skywriter
      • Piano HAT
    • STS Pi
    • Pi Camera >
      • Pi-Cam, Python & Email >
        • Time Lapse
      • Pi Noir
    • Pipsta >
      • Flask, Input & Printers
    • Raspberry Pi Power >
      • Energenie IR power
    • Pibrella
    • Distance Sensor
    • LCD Screen
    • Pi-Tooth
    • Robot Arm
    • PiGlow
    • PiFM
    • Accelerometer
    • PiFace >
      • Installing PiFace >
        • Python Commands
  • Pi-Hacks
    • Drone Hacks
    • Pi Glue Gun Hack
    • Blinkt!
    • Sonic Pixels
    • R2D2
    • Get to the chopper
    • Astro Bird
    • Twitter Translator
    • Hacking a Robot
    • Nature_Box >
      • Best Nature Photos
    • Wearable Tech >
      • Project New York
      • P.N.Y Part 2 Health
      • P.N.Y Part 3 Games
      • P.N.Y Part 4 Translation
    • Dino-Tweet
    • Other Links
  • Pi-Hacks 2
    • The Joker
    • Hologram Machine
    • Google Vision: Camera Tell
    • Yoda Tweets
    • Pi Phone
    • Darth Beats
    • Twitter Keyword Finder
    • Crimbo Lights Hack
    • Xmas Elf
    • Halloween 2016
    • Halloween Hack 2015
    • Socrative Zombie
    • Voice Translation
    • The Blue-Who Finder
    • GPIO, Twitter
    • Pi Chat Bot >
      • Dictionary Definitions
    • PiGlow & Email
    • Pibrella Alarm System
    • SMS with Python >
      • Spooking a Mobile
  • Pi-Hacks 3
    • Ferminal
    • Crypto Tracker
    • David Bowie
    • Lamp Prank >
      • TEST
    • Yoda FM
    • Retro Player
    • LED Pixel Art
    • TARDIS
    • Battleships
    • LED Board
    • Night Vision
    • Enviro+ Weather
  • Minecraft
    • Minecraft API
    • Minecraft Sweeper
    • PiGlove: Minecraft Power Up
    • Minecraft Photo-booth
    • Rendering Pixels
    • Speed Cube
    • Lucky Dip
  • Computing
    • Why Computing?
    • Can You Compute
    • micro:bit
    • Coding Resources
    • Learn to Code >
      • Coding with iPads
      • Apps Creation Tools
      • sKratchInn
      • Sound Editing
    • Cheat Sheets
    • Theory
    • HOUR OF CODING
    • BEBRAS Computing Challange
    • Computer Facts
    • Free Software and Links
  • Contact Me
  • Random Hacks

CRON: What is it?


Cron is a utility that can be used to schedule jobs on the Raspberry Pi and its computer operating systems.  You can set up and use CRON to maintain software environments or schedule jobs (commands or shell scripts) to run periodically at fixed times, dates, or intervals.  This page will cover the various CRON jobs.

Job 1: Automatically Running a Python Program on Boot up


1) Record where the Python program is saved, for example in the “/home/pi/” and         called final.py therefore /home/pi/final.py

2) Double check you’ve got the correct path by typing : 
    sudo cat  /home/pi/name_of_your_script.py
    If correct this will show the contents of your Python code.

3) Next create a Cron job by modifying the “crontab”. 

4) To edit it type sudo crontab –e (this will run the Cron task for all users)

5) Scroll to the bottom of the window and add the following line, 
    @reboot python /home/pi/name_of_your_program.py &
   Don’t forget the “&” at the end, this will run in the code in the background and        the Raspberry Pi will boot up as normal.

6) Save the file using “CTRL-X”, then select “Y” 

7) Reboot the Pi with sudo reboot

To stop the program running type:
ps aux | grep /home/pi/name_of_your_script.py
This will give you the process number type:
Sudo kill and the process number
For example: sudo kill 1867

You can also remove the reboot code from the crontab, to stop the code from running at reboot:
sudo crontab –e
Then delete the line of code

Powered by Create your own unique website with customizable templates.