Add a check for absolute path

contrib/validation/validate_lethe.sh

@@ -36,7 +36,7 @@ show_help() {
     echo
     echo "Options:"
     echo "  -h, --help       Display this help message"
-    echo "  -o, --output     Specify the output directory for validation results"
+    echo "  -o, --output     Specify the absolute path directory for validation results"
     echo
     echo "Description:"
     echo "This script automates the validation of the Computational Fluid Dynamics (CFD)"
@@ -121,6 +121,11 @@ if [[ -z $output_path ]]; then
     exit 1
 fi
 
+if [[ "$output_path" != /* ]]; then
+    echo "Error: The path '$output_path' is not an absolute path." >&2
+    exit 1
+fi
+
 echo "The output path has been set to $output_path"
 verify_or_create_folder "$output_path"
 lethe_path=$(pwd)