set_param

#!/bin/bash
# set -x
#
# Script to allow easy update of the parameter file.
#
# For options:  ./set_param
#

THIS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

l_param_name=$(tr '[:lower:]' '[:upper:]' <<< $1)
l_param_value=$2
l_param_file=${THIS_DIR}/autoInstall.params

if [[ -z "${l_param_name}" ]]; then
    echo "Usage of $BASH_SOURCE"
    echo "$BASH_SOURCE RESET                  <-- Resets parameters to default values"
    echo "$BASH_SOURCE SHOW                   <-- Resets parameters to default values"
    echo "$BASH_SOURCE PARAM_NAME PARAM_VALUE <-- Updates parameter to new value"
    exit 0
fi

## Reset command
if [[ "${l_param_name}" = "RESET" ]]; then
    read -p "Confirm - this will clear any parameter changes. (Y to confirm) : " l_confirm
    echo "Confirm = $l_confirm"
    if [[ "$l_confirm" == "Y" ]]; then
        cp ${THIS_DIR}/scripts/autoInstall.params.reset $l_param_file
        echo "$l_param_file reset to default values"
    else
        echo "No changes made.."
    fi
    exit 0
elif [[ "${l_param_name}" = "SHOW" ]]; then
    echo "Current parameter values..."
    grep "=" ${l_param_file}
    exit 0
elif [[ -n "${l_param_name}" ]]; then
    echo "Current parameter value..."
    grep "${l_param_name}=" ${l_param_file}
fi

## Past this point, we require parameter value
if [[ -z "${l_param_value}" ]] ; then
    exit 0;
fi

if [[ -n $(grep "${l_param_name}=" ${l_param_file}) ]]; then
    # change parameter value
    sed -i.bak -E "s|${l_param_name}=.+|${l_param_name}=${l_param_value}|" ${l_param_file}
    # Show the current value
    echo "Updated parameter value..."
    grep "${l_param_name}=" ${l_param_file}
else
    echo "Current value could not be found. No changes made."
fi