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Top Forums UNIX for Dummies Questions & Answers what's the difference between signal and semaphore? Post 302524101 by Chirel on Saturday 21st of May 2011 01:29:22 PM
Old 05-21-2011
Right, no data buffers for signal, it's used to tell something coded by a number to a running process.

You can send a running process a signal, it's for example the work done by the kill command.
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killall(1M)															       killall(1M)

NAME
killall - kill all active processes SYNOPSIS
[signal] DESCRIPTION
is a procedure used by to kill all active processes not directly related to the shutdown procedure. is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted. sends the specified signal to all user processes in the system, with the following exceptions: the process; all processes (including background processes) associated with the terminal from which was invoked; any process, if owned by any process, if owned by any process; any process; any process. obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)). If no signal is specified, a default of (kill) is used. is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)). FILES
SEE ALSO
fuser(1M), kill(1), ps(1), shutdown(1M), signal(5). STANDARDS CONFORMANCE
killall(1M)
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