![]() Visit, and toggle the less secure app access to ON, as shown in the gif below: Since Google doesn't allow its services to be accessible by less secure apps, we need to enable access for the email account to be used in the SMTP settings.Set certificate_file = "~/.mutt/certificates" Set message_cachedir = "~/.mutt/cache/bodies" Set header_cache = "~/.mutt/cache/headers" Once installed, use your text editor to the mutt.rc file in your home directory: /home/user/mutt/mutt.rc.Įdit your file so it looks like this, changing the template data with your email: set ssl_starttls=yes The script will start the cron process, install, a command-line SMTP client, to send emails.$ git clone $ cd watchmon $ bash setup.sh Follow their README to learn how to set it up: This example is configured to send an email to a Gmail account, you may need to tweak your configurations for other email providers. The following demo was tested on Ubuntu 20.04.1 LTS. We'll put this script in a cron job that runs every minute. If either metric is above a certain threshold, we will get an email to alert us. We are going to create a cron job that monitors disk and RAM usage using Watchmon. There are numerous tools available online to simplify the creation of expressions is one of the widely popular tools available online at /. */20 * 1-10 10,11,12 * df -h > /tmp/diskusageĬron expressions can be overwhelming at first sight. And here's a more complicated example where we save disk usage every 20 minutes on the first 10 days of the last three months of the year:.Here's how to run echo "hello there!" on the "4th day of every week" (i.e.That's a lot of options to understand, it might be best to show how they work with some examples: ![]() To run a script every minute for the first 10 minutes, the expression in the minute column can be given as: 0-10 To run a script every 10 minutes, the minute column can be given as */10 For example, to run a script every 10 minutes, the minute column can be given as 0,10,20,30,40,50Īn alternative, simpler version of ",". To repeat a task in multiple different time frames, commas can be used. For example, * defined under the minute column, will execute the script every minute Here's an image with a system crontab that references two external scripts:Īlongside numbers, there are special characters we can use when editing a crontab: Charactersĭefining this will run the command for each time frame. A cron table is a configuration file containing the shell commands in each line preceded by a cron expression. A cron expression is a string that details the schedule to trigger a command. ![]() To master cron and scheduling, it helps to have a grasp of various but similar terminology used.Ĭron is the program that schedules scripts or commands to run at user-specified times. After going over cron basics, we'll look at the crontab command to manage our scheduled tasks. This utility is a task scheduler for Unix-like systems. In this article, we will look at the cron program. On a server, it's not uncommon for a myriad of checks and clean up routines to be scheduled to ensure applications are running optimally. On a desktop, we may schedule update checks or virus scans. When managing a computer, we may want to automate some tasks to run in certain periods or at the same time on each day/week/month.
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