Add check-dummy.sh script

Added a new bash script that always returns OK. The script has usage instructions and exit codes. It also uses getopt to parse arguments.

Significant changes:
- Added check-dummy.sh
- Script always returns OK
- Usage instructions added
- Exit codes defined
- Getopt used for argument parsing

check-dummy.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+
+#
+#/
+#/ Usage:
+#/ check-dummy.sh 
+#/
+#/ Does not check anything. Always gives OK!
+#/ 
+#/ 
+#/ Exit Codes:
+#/  0 Everything OK
+#/
+
+Usage() {
+    grep '^#/' "${script_dir}/${script_name}" | sed 's/^#\/\w*//'
+}
+
+GetOptions() {
+    # https://stackoverflow.com/a/29754866
+    OPTIONS=''
+    LONGOPTS=''
+
+    # -use ! and PIPESTATUS to get exit code with errexit set
+    # -temporarily store output to be able to check for errors
+    # -activate quoting/enhanced mode (e.g. by writing out “--options”)
+    # -pass arguments only via   -- "$@"   to separate them correctly
+    ! PARSED=$(getopt --options=$OPTIONS --longoptions=$LONGOPTS --name "$0" -- "$@")
+    if [[ ${PIPESTATUS[0]} -ne 0 ]]; then
+        # e.g. return value is 1
+        #  then getopt has complained about wrong arguments to stdout
+        Usage
+        exit 2
+    fi
+
+    # read getopt's output this way to handle the quoting right:
+    eval set -- "$PARSED"
+
+    # now enjoy the options in order and nicely split until we see --
+    while true; do
+        case "$1" in
+            --)
+                shift
+                break
+                ;;
+            *)
+                echo "URL UNKNOWN - ${1} is not a valid parameter"
+                exit 3
+                ;;
+        esac
+    done
+
+    if [ -z ${1+x} ]; then 
+        echo "URL UNKNOWN - url not given"
+        exit 3
+    else 
+        url=${1}
+    fi
+}
+echo "DUMMY OK"
+exit 0