key1 = This is 1st value

key2 = this is 2nd value

key3

#!/bin/bash

# Read configuration into an associative array
declare -A CONFIG
# IFS is the 'internal field separator'. In this case, your file uses '='
IFS="="
while read -r key value
do
    if [ -n $value ]; then
        CONFIG[$key]=$value
    else
        CONFIG[$key]=$value
    fi
done < YOUR_CONFIG_FILENAME
unset IFS

# If a parameter is passed, look it up by that, else print everything.
if [ $1 ]; then
    if [ -n ${CONFIG[$1]} ]; then
        echo "Key: $1, Value: ${CONFIG[$1]}"
    else
        echo "The key '$1' does not exist"
    fi
else
    for key in "${!CONFIG[@]}"; do
        if [ -n ${CONFIG[$key]} ]; then
            echo "Key: $key, Value: ${CONFIG[$key]}"
        else
            echo "Key: $key has no value"
        fi
    done
fi

exit $?

#!/bin/bash
PROPERTY_FILE=filename.properties

function getProperty {
   PROP_KEY=$1
   PROP_VALUE=`cat $PROPERTY_FILE | grep "$PROP_KEY" | cut -d'=' -f2`
   echo $PROP_VALUE
}

echo "# Reading property from $PROPERTY_FILE"
DB_USER=$(getProperty "db.username")
DB_PASS=$(getProperty "db.password")
ROOT_LOC=$(getProperty "root.location")
echo $DB_USER
echo $DB_PASS
echo $ROOT_LOC
echo "Writing on DB ... "
mysql -u$DB_USER -p$DB_PASS dbname<<EOFMYSQL

update preference set tablename.value_ = "$ROOT_LOC" where tablename.name_="Root directory location";
EOFMYSQL
echo "Writing root location($ROOT_LOC) is done ... "
counter=`mysql -u${DB_USER} -p${DB_PASS} dbname -e "select count(*) from tablename where tablename.name_='Root directory location' and tablename.value_ = '$ROOT_LOC';" | grep -v "count"`;

if [ "$counter" = "1" ]
then
echo "ROOT location updated"
fi