term - Kills processes by their names

#!/bin/sh
# term v1.0 - Kills processes by their names. If several processes use the same name they're all gonna be terminated.

if [ -z "$1" ]; then
    ps -e
    exit
else
    PID=$(ps -e | grep $1 | awk -F ' ' '{print $1}')
fi
if [ -z "$PID" ]; then
    echo $1": No active process with that name."
    exit 1
fi
for NUM in $PID; do
    kill $NUM
done