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Full Discussion: Killing idle user processes
Top Forums UNIX for Dummies Questions & Answers Killing idle user processes Post 19588 by mikek147 on Saturday 13th of April 2002 05:42:23 PM
Old 04-13-2002
Uning the kill command with the signal of 9 is a dangerous way of terminating a process. The 9 signal is an absolute and unblockable form of termination. This means that if a process has, for example, multiple files open or has a database open, although the user may be gone, the files can remain open or the database left in an unstable condition.

If you must kill a process, use kill with signal 15 or without a signal. Using kill without a signal, it defaults to signal 15 anyway, which notifies the offending process to shut down. If the process is written correctly, it will close down transactions or any open files and exit cleanly. -mk
 

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KILL(1) 							   User Commands							   KILL(1)

NAME
kill - send a signal to a process SYNOPSIS
kill [options] <pid> [...] DESCRIPTION
The default signal for kill is TERM. Use -l or -L to list available signals. Particularly useful signals include HUP, INT, KILL, STOP, CONT, and 0. Alternate signals may be specified in three ways: -9, -SIGKILL or -KILL. Negative PID values may be used to choose whole process groups; see the PGID column in ps command output. A PID of -1 is special; it indicates all processes except the kill process itself and init. OPTIONS
<pid> [...] Send signal to every <pid> listed. -<signal> -s <signal> --signal <signal> Specify the signal to be sent. The signal can be specified by using name or number. The behavior of signals is explained in sig- nal(7) manual page. -l, --list [signal] List signal names. This option has optional argument, which will convert signal number to signal name, or other way round. -L, --table List signal names in a nice table. NOTES Your shell (command line interpreter) may have a built-in kill command. You may need to run the command described here as /bin/kill to solve the conflict. EXAMPLES
kill -9 -1 Kill all processes you can kill. kill -l 11 Translate number 11 into a signal name. kill -L List the available signal choices in a nice table. kill 123 543 2341 3453 Send the default signal, SIGTERM, to all those processes. SEE ALSO
kill(2), killall(1), nice(1), pkill(1), renice(1), signal(7), skill(1) STANDARDS
This command meets appropriate standards. The -L flag is Linux-specific. AUTHOR
Albert Cahalan <albert@users.sf.net> wrote kill in 1999 to replace a bsdutils one that was not standards compliant. The util-linux one might also work correctly. REPORTING BUGS
Please send bug reports to <procps@freelists.org> procps-ng October 2011 KILL(1)
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