- In Dept Guide: How to create a shell script to send an alert email when the server is about to run out of space (Ubuntu server based but most Linux) https://livefiredev.com/a-shell-script-for-disk-space-low-alert-emails-ubuntu-linux/ 5 comments commandline
- RegexOne - Learn Regular Expressions - Lesson 1: An Introduction, and the ABCs http://regexone.com/ 192 comments
- grep(1) - Linux manual page https://man7.org/linux/man-pages/man1/grep.1.html 30 comments
- The GNU Awk User’s Guide https://www.gnu.org/software/gawk/manual/gawk.html#Regexp-Operators 11 comments
- Email Delivery, API, Marketing Service | SendGrid http://www.sendgrid.com/ 10 comments
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