BASH config parser; reads three value pairs from .cfg file (I use it to store the target file as well so I can modifiy multiple configuration files) ignores whitespace and comments.

confparser.sh

#!/bin/bash
set -o nounset                              # Treat unset variables as an error
shopt -s extglob

configfile="file.properties"
WEB_VARIABLE_FROM_PARRENT="www.example.com"

tr -d '\r' < $configfile | while IFS='= ' read TARGETFILE VARNAME VARVALUE
do
        # Don't declare variables here, you are in a sub-shell that dies
        # when exitting while.
    if [[ ! $TARGETFILE =~ ^\ *# && -n $TARGETFILE ]]; then
        VARVALUE="${VARVALUE%%\#*}"    # Del in line right comments
        VARVALUE="${VARVALUE%%*( )}"   # Del trailing spaces
        VARVALUE="${VARVALUE%\"*}"     # Del opening string quotes
        VARVALUE="${VARVALUE#\"*}"     # Del closing string quotes
# echo the values read; 
        echo "[ $TARGETFILE ] -- [ $VARNAME ] -- [ $(eval echo "\"$VARVALUE\"") ]"
    fi
done

file.properties

# comments work here

db.conf user=user
db.conf pass=password
db.conf database=db

# whitespace between lines works as well

web.conf path=/var/www
web.conf url=${WEB_VARIABLE_FROM_PARRENT}

# Having a proper EOL (or a comment on last line) is important