Reads a file containing an expression of the form KEY=VALUE, and it gets just the VALUE.

simple_config_file_parse.sh

#!/bin/bash

# The path to the file.
FILE=/path/to/my/file

# Read the file's contents.
CONFIG_CONTENTS=$(<$FILE)

# Split at the '='.
PARTS=(${CONFIG_CONTENTS//=/ })

# The VALUE will be just the second part.
VALUE=${PARTS[1]}

if [[ -z $VALUE ]]; then
    echo "No value."
else
    echo "The value is: $VALUE"
fi