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This subchapter looks at kill, a UNIX (and Linux) command.
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This subchapter looks at kill, a UNIX (and Linux) command.
kill is used to stop processes.
kill is a builtin command in csh. There is also an external utility with the same name and functionality.
An ordinary user can only kill his or her own processes.
A system administrator running as root (including using sudo) can use kill on any process on the entire system.
Sometimes a process (particularly web browsers) will freeze up. The kill command can be used to rmove the frozen program from the system.
If a user finds their display locked up because of a frozen program, he or she can login to another computer, then login to the original system using rlogin, and then use the kill command to stop the offending process using the specific process ID.
killall is a related command. killall program_name will stop all processes with the program name, so the more specific kill with a specific process ID is usually used first.
UNIX does a very good job of keeping processes isolated from each other, so that no rogue process can attack or damage any other process.
Unlike Windows, a frozen or crashed program on UNIX or Linux shouldn’t be able to bring the entire operating system to a halt.
Most UNIX vendors carefully test their own system software and most of the system software has been running and tested for decades, so those programs rarely cause problems.
Most bugs occur in third party software and in custom software developed for a particular installation.
On November 8, 2010, Ramesh Natarajan named this the number 26 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 5, 2012
Last Updated: October 4, 2012
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