Bash - Kill a process

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How to kill a process

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Utility

kill

kill is bash builtin command

kill [-s sigspec | -n signum | -sigspec] [pid | jobspec] ...
kill -l [sigspec | exit_status]

Send the signal named by sigspec or signum to the processes named by pid or jobspec. sigspec is either a case-insensitive signal name such as SIGKILL (with or without the SIG prefix) or a signal number; signum is a signal number. If sigspec is not present, then SIGTERM is assumed. An argument of -l lists the signal names. If any arguments are supplied when -l is given, the names of the signals corresponding to the arguments are listed, and the return status is 0. The exit_status argument to -l is a number specifying either a signal number or the exit status of a process terminated by a signal. kill returns true if at least one signal was successfully sent, or false if an error occurs or an invalid option is encountered.

pkill

pkill will look up or signal processes based on name and other attributes

Syntax

pkill [-signal] [-fvx] [-n|-o] [-P ppid,...] [-g pgrp,...]
            [-s sid,...] [-u euid,...] [-U uid,...] [-G gid,...]
            [-t term,...] [pattern]

where:

• - f The full command line is used to match a process with the pattern (Default: process name)

Example

SIGKILL handler

########### SIGKILL handler ############
function _kill() {
   echo "SIGKILL received, shutting down database!"
}

Kill.sh

#!/bin/sh

get_pid ()
{
    os_name=`uname -s`

    case "$os_name" in
	SunOS)
	    ANA_VARIANT="Solaris";;
	HP-UX)
	    ANA_VARIANT="HPUX";;
	AIX)
	    ANA_VARIANT="AIX";;
	Linux)
	    ANA_VARIANT="Linux";;
	CYGWIN_NT-5.*)
	    ANA_VARIANT="Windows";;
	*)
	    ANA_VARIANT="UnknownOS"
    esac

    if [ "$ANA_VARIANT" = "AIX" ]; then
    	echo `ps -u$LOGNAME | grep $1 | awk '{print $2}'` 
    else
    	echo `ps -u$LOGNAME | grep $1 | awk '{print $1}'` 
    fi
}

pid=`get_pid $1`
if test "$pid" ; then
    echo "Killing $1"
    kill -9 $pid
fi
exit 0

where pid is the process id

Wait a little bit before killing

wait_until_done ()
{
  pid=$1
  cnt=${DRILLBIT_TIMEOUT:-300}
  origcnt=$cnt
  while kill -0 $pid > /dev/null 2>&1; do
    if [ $cnt -gt 1 ]; then
      cnt=`expr $cnt - 1`
      sleep 1
    else
      echo "Process did not complete after $origcnt seconds, killing."
      kill -9 $pid
      exit 1
    fi
  done
  return 0
}