diff --git a/gaboshlib/g_num_valid_number.sh b/gaboshlib/g_num_valid_number.sh
new file mode 100644
index 0000000..ed5aa82
--- /dev/null
+++ b/gaboshlib/g_num_valid_number.sh
@@ -0,0 +1,11 @@
+function g_num_valid_number {
+  local f_num
+  for f_num in $@
+  do
+    if ! [[ ${f_num} =~ ^(-)?(\.)?[0-9]+(\.[0-9]+)?$ ]]
+    then
+      g_echo "\"${f_num}\": Not a valid number"
+      return 1
+    fi
+  done
+}