VHANGUP
VHANGUP
NAMESYNOPSIS
DESCRIPTION
EXAMPLES
RETURN VALUE
SEE ALSO
COPYRIGHT
AUTHOR
NAME
Vhangup − Cause a virtually hangup on the specified terminals
SYNOPSIS
vhangup [/dev/<terminal> [/dev/<terminal>]]
DESCRIPTION
vhangup simulates a hangup on the specified terminals. Not existing device files or devices will be ignored.
EXAMPLES
vhangup /dev/tty1 /dev/tty2 /dev/tty3 /dev/tty4 /dev/tty5 /dev/tty6 /dev/ttyS1
This will replace all open file descriptors in the kernel that points to the listed ttys by a dummy that will deny further reading/writing to the device. It also send the signals SIGHUP/SIGCONT to the processes which have file descriptors open on the listed ttys.
RETURN VALUE
On success, zero is returned. On error, 1 is returned.
SEE ALSO
vhangup(2), tty(4), ttyS(4), pts(4).
COPYRIGHT
2008 Werner Fink, 2008 SUSE LINUX Products GmbH, Germany.
AUTHOR
Werner Fink <werner@suse.de>
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
