nicekill: A bash script to terminate a process in the order of SIGTERM, SIGINT, SIGHUP, SIGKILL, giving each signal 2 seconds to enact.

nicekill.sh

#!/bin/bash

# $1: PID
# Returns true if a process exists with pid=PID
function isProcessAlive  {
    if [ `ps -p $1 | wc -l` -gt 1 ] ; then
        return 0;
    else
        return 1;
    fi
}

# 1:$PID,  $2:SIGNAL
# Attempts to kill process-pid PID, using signal SIGNAL
# It checks to see if it succeeded every 0.1 seconds for 2 seconds.
# Returns true if success, false otherwise
function killProcess {
    kill -$2 $1
    sleep 0.1
    for i in {0..19} ; do
        if isProcessAlive $1 ; then
            sleep 0.1;
        else
            return 0;
        fi
    done
    return 1;
}

# $1:PID,  $2:SIGNAL,  $3:SIGNAL-TEXT
function writeSucess {
    echo "Process $1 terminated with signal $2 (SIG$3)";
    exit
}

# $1:PID,  $2:SIGNAL,  $3:SIGNAL-TEXT
function attemptKill {
    if killProcess $1 $2 ; then writeSucess $1 $2 $3 ; fi
}

if [ $# -eq 0 ] ; then
    echo "Usage: ./nicekill ProcessID"
fi

if isProcessActive $1
then
    attemptKill $1 15 TERM
    attemptKill $1  2 INT
    attemptKill $1  1 HUP
    attemptKill $1  9 KILL

    # Attempt to remove with
    echo "Failed to terminate process $1."
    ps -p $1
else
    echo "No process found with id $1."
fi