A Linux Foundation Certified System Administrator (LFCS) has the expertise to do basic to intermediate system administration from the command-line for systems running Linux. Linux Foundation Certified System Administrators are knowledgeable in the operational support of Linux systems and services. They are responsible for first line troubleshooting and analysis, and choose when to raise issues to engineering teams.

The series will be titled Preparation for the LFCS (Linux Foundation Certified Sysadmin) Parts 1 through 10 and cover the following topics for Ubuntu, CentOS, and openSUSE:

Part 1: How to use GNU ‘sed’ Command to Create, Edit, and Manipulate files in Linux

Note: This article also touches on the use of several other commands used for processing text streams in Linux, such as uniq, sort, grep, tr, and cut.

Full article here:
LFCS: How to use GNU ‘sed’ Command to Create, Edit, and Manipulate files in Linux – Part 1 (Tecmint)