Crontab is used to schedule, load or remove scripts. You can schedule your scripts depending upon your needs. Syntax of scheduling a script differs upon time. Some basic commands of crontab are
# crontab -l (List crontabs)
# crontab -r (Removes the crontab file)
# crontab -e (Edit the contab file)
You can use crontab -e to add and remove or comment out the scripts, basic syntax for crontabs will be like the following
* * * * * /tmp/michael.sh
The "*" sign holds a very important value as it every * has some value and you can schedule your crons depending upon the value of *
* * * * *
min hr day of month month day of week
So these five values can be set by putting your desired values
Now we will see some examples
Lets suppose we want to execute a script on the first date of every month at 00:45
45 * 1 * * /tmp/michael.sh
If we want to execute a script from Monday to Friday and from 9AM to 4PM it will be written as
00 09-16 * * 1-5 /tmp/michael.sh
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