#!/usr/bin/bash

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# what:        modify single value in a config file
# author:      klevstul
# started:     mar 2021
#
# requires:    n/a
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

if [ "$EUID" -eq 0 ]
  then echo "error: do not run as 'root'"
  exit
fi

this_file_name=`basename "$0"`
if [ $# -ne 4 ]; then
    echo "usage: '$this_file_name [TARGET_KEY] [REPLACEMENT_VALUE] [KEY_VALUE_SEPARATOR] [CONFIG_FILE]'"
    exit 1
fi

target_key=$1
replacement_value=$2
key_value_separator=$3
config_file=$4

# https://stackoverflow.com/questions/2464760/modify-config-file-using-bash-script
sed -i "s/\($target_key*$key_value_separator*\).*/\1$replacement_value/" $config_file