close_app.sh

#!/bin/bash
 
# To close a misbehaving program properly.
#
# by desgua ([email protected])
#
# License GPL
#
# version 0.03 02/22/2013
 
name=$(echo $0 | sed 's/.*\///')
if [ $# -ne 1 ]; then
 
echo "
Usage: $name <app to be closed>
 
Example: $name gedit
 
Info for kill signals: http://pthree.org/2012/08/14/appropriate-use-of-kill-9-pid
"
 
exit 1
fi
 
app=$1
 
function CLOSE {
if [[ "$a" == "10" ]]; then
    DECISION
fi
 
kill -15 `pidof $app`
 
sleep .5
 
if [[ "$(pidof $app)" == "" ]]; then
    echo "The app $app has been closed successfully."
    exit 0
else
    a=$(echo $a+1 | bc)
    CLOSE
fi
}
 
function DECISION {
clear
read -n 1 -p "I have tried to close the app $app for $a times now. What to do?
   [1] Keep trying more $a times.
   [2] Kill.
   [3] Exit leaving it open.
   " b
 
    if [[ "$b" == "1" ]]; then
        a=0
        CLOSE
    fi
   
    if [[ "$b" == "2" ]]; then
        KILL
    fi
 
    if [[ "$b" == "3" ]]; then
        echo
        echo
        echo "Goodbye then."
        echo
        exit 1
    fi
 
DECISION
}
 
function KILL {
clear
echo "Trying SIGHUP (kill -1): flush any data to disk that needs to be written, and cleans up the memory registers, then restarts the program."
 
kill -1 `pidof $app`
 
sleep .5
 
if [[ "$(pidof $app)" == "" ]]; then
    echo "The app $app has been closed with SIGHUP (kill -1)."
    exit 0
fi
 
echo; echo
 
echo "Trying SIGINT (kill -2). This is an interrupt from the keyboard signal. This is equivalent to sending a CTRL-C to the PID. This is useful when the PID is not in the terminal foreground, but has been backgrounded as a daemon process."
 
kill -2 `pidof $app`
 
sleep .5
 
if [[ "$(pidof $app)" == "" ]]; then
    echo "The app $app has been closed with SIGHUP SIGINT (kill -2)."
    exit 0
fi
 
echo; echo
 
echo "Trying SIGSEGV (kill -11). This causes the program to experience a segmentation fault, and close the PID. It won’t flush any data that needs to be written to disk, but it may create a core dump file that could be useful in debugging, on learning why the program was behaving the way it was. The logging facility for that core dump is through the kernel."
 
kill -11 `pidof $app`
 
sleep .5
 
if [[ "$(pidof $app)" == "" ]]; then
    echo "The app $app has been closed with SIGSEGV (kill -11)."
    exit 0
fi
 
echo; echo
 
echo "Trying SIGKILL (kill -9). It will not sync any data to disk. No unwritten data, no debugging data, no logging data, no nothing. It’s equivalent to using a sledge hammer to sink a nail..."
 
kill -9 `pidof $app`
 
sleep .5
 
if [[ "$(pidof $app)" == "" ]]; then
    echo "The app $app has been closed with SIGKILL (kill -9)."
    exit 0
fi
 
clear
 
echo "I am so sorry nothing has worked."
sleep 2
a=$(echo -n "many times and with many differents signals more then 10")
DECISION
}
 
if [[ "$(pidof $app)" == "" ]]; then
    echo "The app $app is not running."
    exit 1
else
    a=0
    CLOSE
fi
 
exit 2