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Top Forums UNIX for Beginners Questions & Answers Rm -rf unable to kill pid on AIX Post 303045484 by jim mcnamara on Friday 27th of March 2020 10:17:46 AM
Old 03-27-2020
I think that people's associations associations for the the word 'zombie' get in the way of dealing with it. They are not supposed to be scary or a scourge on the face of the earth. Just an "oops" kind of user action. We all have had "oops" moments.

Over time dozens of users have asked me to kill zombies. Because they could not kill them. They never like the answer. As in this case.

Zombies are okay. A few at a time. Way too many of them uses up available process slots. Which will ultimately force a production reboot.
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KILLALL(1)						    BSD General Commands Manual 						KILLALL(1)

NAME
killall -- kill processes by name SYNOPSIS
killall [-delmsvz] [-help] [-u user] [-t tty] [-c procname] [-SIGNAL] [procname ...] DESCRIPTION
The killall utility kills processes selected by name, as opposed to the selection by pid as done by kill(1). By default, it will send a TERM signal to all processes with a real UID identical to the caller of killall that match the name procname. The super-user is allowed to kill any process. The options are as follows: -d | -v Be more verbose about what will be done. For a single -d option, a list of the processes that will be sent the signal will be printed, or a message indicating that no matching processes have been found. -e Use the effective user ID instead of the (default) real user ID for matching processes specified with the -u option. -help Give a help on the command usage and exit. -l List the names of the available signals and exit, like in kill(1). -m Match the argument procname as a (case sensitive) regular expression against the names of processes found. CAUTION! This is dangerous, a single dot will match any process running under the real UID of the caller. -s Show only what would be done, but do not send any signal. -SIGNAL Send a different signal instead of the default TERM. The signal may be specified either as a name (with or without a lead- ing SIG), or numerically. -u user Limit potentially matching processes to those belonging to the specified user. -t tty Limit potentially matching processes to those running on the specified tty. -c procname When used with the -u or -t flags, limit potentially matching processes to those matching the specified procname. -z Do not skip zombies. This should not have any effect except to print a few error messages if there are zombie processes that match the specified pattern. ALL PROCESSES
Sending a signal to all processes with uid XYZ is already supported by kill(1). So use kill(1) for this job (e.g. $ kill -TERM -1 or as root $ echo kill -TERM -1 | su -m <user>) EXIT STATUS
The killall command will respond with a short usage message and exit with a status of 2 in case of a command error. A status of 1 will be returned if either no matching process has been found or not all processes have been signalled successfully. Otherwise, a status of 0 will be returned. DIAGNOSTICS
Diagnostic messages will only be printed if requested by -d options. SEE ALSO
kill(1), sysctl(3) HISTORY
The killall command appeared in FreeBSD 2.1. It has been modeled after the killall command as available on other platforms. AUTHORS
The killall program was originally written in Perl and was contributed by Wolfram Schneider, this manual page has been written by Jorg Wunsch. The current version of killall was rewritten in C by Peter Wemm using sysctl(3). BSD
January 26, 2004 BSD

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