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This subchapter looks at free, a Linux command.
free is used to show free memory.
free book on UNIX/Linux System AdministrationTeach Yourself UNIX/Linux System Administration and Shell Programming free computer programming text book projecttable of contents
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This subchapter looks at free, a Linux only command.
free displays the total amount of free and used physical memory and swap space in the system, as well as the buffers and cache consumed by the kernel.
The default is to report the memory size in bytes. Use the -g option to display in Gigabytes. Use the -m option to display in Megabytes. Use the -k option to display in Kilobytes. Use the -b option to display in Bytes.
Use the -t option to view total memory.
Use the -l option to view low vs. high memory usage.
The default is to display the information once and then return to the normal shell. Use the -s n option (where n is the number of times to display) to keep displaying the memory usage (until interrupted). Use the -c n or --count=n options (where n is the number of times to display the memory statistics).
Use the Activity Monitor for this purpose. From the command line, you can get similar results from vm_stat. vm_stat is a Mach-specific version of the UNIX command vmstat Also:
$ echo -e "\n$(top -l 1 | awk '/PhysMem/';)\n"
On November 8, 2010, Ramesh Natarajan named this the number 23 most frequently used UNIX/Linux command at this web page 50 Most Frequently Used UNIX / Linux Commands (With Examples).
Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).
View music player in action: www.musicinpublic.com/.
Create your own copy from the original source code/ (presented for learning programming).
Work on this project is very slow because I am homeless. I am available for work if someone can provide an indoor place to work in Costa Mesa, California, electricity, internet connections, a flat raised working surface (such as a table or desk), a sitting device (such as a chair or stool), and a fully functional reasonably modern used computer. I’m already homeless, so you don’t need to pay me (and I understand how much business people hate the minimum wage law). Just give me a chance to work.
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Because I no longer have the computer and software to make PDFs, the book is available as an HTML file, which you can convert into a PDF.
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free book on UNIX/Linux System AdministrationTeach Yourself UNIX/Linux System Administration and Shell Programming free computer programming text book projectBuilding a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming. If you like the idea of this project, At the time I am homeless. This greatly interferes with my ability to create this project, which can help nearly 20 million U.S. college students and more than 150 million students world-wide. I am looking for 30 rich people or corporations willing to donate $10 a month to my church so that the church can provide a place indoors for me to continue work. If you want to donate, please see help project. Thanks much. Supporting the entire project: If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church) Some or all of the material on this web page appears in the |
I do the news as an unpaid volunteer for KOCI 101.5 FM, Newport Beach/Costa Mesa (also available on the web)
This web site handcrafted on Macintosh 
computers using Tom Bender’s Tex-Edit Plus 
and served using FreeBSD 
.
†UNIX used as a generic term unless specifically used as a trademark (such as in the phrase “UNIX certified”). UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.
Names and logos of various OSs are trademarks of their respective owners.
Copyright © 2012 Milo
Created: February 2, 2012
Last Updated: July 10, 2012
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