This is a quick video on how to utilise the CAT and SUM command. I am currently using this on RHEL. However, these commands are very common and will likely work across most Linux OS.
Check out more related content at: https://youtu.be/mVLG21QRC0Q
Check out a virtual lesson by Adam at: https://rallypoint.withyouwithme.com/cyber/linux-system-administrator-virtual-lesson-1-introductionlinux-in-a-cloud-platform/