added dependecy check

routerapi.sh

@@ -1,5 +1,15 @@
 #!/bin/bash
 
+dependency_check(){
+	for DEPENDENCY; do
+		if ! command -v "$DEPENDENCY" 1>/dev/null; then
+			printf "%s not found. Please install it.\n" "$DEPENDENCY" >&2
+			exit 2
+		fi
+		done
+	unset DEPENDENCY
+}
+dependency_check "htmlq" "xmlstarlet" "tail" "head" "curl"
 
 home_html=$(curl -s $ROUTER_ADDRESS/html/home.html)
 csrf_token1=$(echo $home_html | htmlq 'meta[name="csrf_token"]' --attribute content | head -n1)