Add script name and directory variables to check-systemctl-service.sh

This commit adds two new variables, script_name and script_dir, to the check-systemctl-service.sh file. These variables are used to store the name of the script and its directory path respectively.

check-systemctl-service.sh

@@ -69,6 +69,8 @@ GetOptions() {
 user=''
 service=''
 LC_NUMERIC="C"
+script_name=$(basename "${0}")
+script_dir=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
 GetOptions "$@"
 
 if [[ $(systemctl ${user} list-unit-files "${service}*" | wc -l) -gt 3 ]]; then