December 2018
Beginner
826 pages
22h 54m
English
Content preview from Linux Administration Cookbook
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free
free is a great way to see how busy your system is at a glance; more specifically, it's the quickest way of finding out how much memory is being used on your box.
Thankfully, free has fewer options than top. Mostly, the flags are just to change the output of the command, making it more human-readable or less, if that's your thing.
Personally, I use -m which outputs the value in mebibytes, but if your system has Gigs of memory, you might find -g more useful.
In the following, you will see free -ht on our centos1 VM: -h is used for human-readable output, giving a nice mix of mebibyte and gibibyte values; -t is a flag to add a Total line, giving a sum of Mem and Swap values:
The important field is available, as it effectively tells you ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.