kill jobs easily

killer.sh

#!/bin/bash
str=$1
list=$(ps -asW | grep ${str})
#list=$(ps -asW | grep ${str} | awk '{print "[" NR "]", $0}')
OLDIFS=${IFS}
IFS=`echo -en "\n\b"`
i=0
for line in ${list}
do
    i=$((i+1))
    echo "[$i]" ${line}
    arr[i]=$(echo ${line} | awk '{print $1}')
done
echo -n ": "
read ans
if [ "${ans}" -gt "0" ] && [ "${ans}" -le "$i" ]
then
    /bin/kill -f ${arr[${ans}]}
else
    echo "I don't like you."
fi