Automatic script run on a specific date and time:

Run a script on a specific date and time:

Linux Crontab Format:

MIN HOUR DOM MON DOW CMD

 Crontab Fields and Allowed Ranges:

Field Description        Allowed Value

MIN   Minute field 0 to 59

HOUR        Hour field   0 to 23

DOM  Day of Month      1-31

MON  Month field 1-12

DOW Day Of Week      0-6

Make New Script Command:

sudo nano launcher.sh

Script:

cd /

cd home/pi/data

sudo python3 file.py

cd /

To exit the editor, press

ctrl+x

To save your changes press the letter

 “Y”

then hit

enter

Script File permission Command:

sudo chmod 755 launcher.sh

Command for Script run in particular date and time:

sudo crontab –e

Code for Script run in 10th June 08:30 AM: Due to this command Script by default run in this specific time:

30 08 10 06 */home/pi/data/launcher.sh >/home/pi/logs/cronlog.log 2>&1

To exit the editor, press

ctrl+x

To save your changes press the letter

 “Y”

then hit

enter

sudo reboot

Command for Script run in every 30 min:

sudo crontab –e

Code for Script run in every 30 min: Due to this command Script by default run in every 30 min:

*/30 * * * * /home/pi/data/launcher.sh >/home/pi/logs/cronlog.log 2>&1

To exit the editor, press

ctrl+x

To save your changes press the letter

 “Y”

then hit

enter

sudo reboot

Example: By default captue pic in specific data and time:

Code:

Command for Make new file

sudo nano file.py

import pygame

import pygame.camera

import requests

import os

import sys

pygame.camera.init()

cam = pygame.camera.Camera("/dev/video0",(640,480))

cam.start()

img = cam.get_image()

pygame.image.save(img,"image.jpg")

Command for Make New Script file

sudo nano launcher.sh

Script:

cd /

cd home/pi/data

sudo python3 file.py

cd /

To exit the editor, press

ctrl+x

To save your changes press the letter

 “Y”

then hit

enter

Command for open crontab:

sudo crontab –e

Code for Script run in 15th June 10:50 AM:

50 10 15 06 */home/pi/data/launcher.sh >/home/pi/logs/cronlog.log 2>&1

To exit the editor, press

ctrl+x

To save your changes press the letter

 “Y”

then hit

enter

sudo reboot