diff --git a/urlgen/urlgen.cr b/urlgen/urlgen.cr
new file mode 100644
index 0000000..548f39c
--- /dev/null
+++ b/urlgen/urlgen.cr
@@ -0,0 +1,5 @@
+# to generate a list of numbered urls in the style of example.com/1,example.com/2,...
+a = ARGV.index("-r") || abort("usage: urlgen -r A-B template")
+s, e = ARGV[a + 1].split('-').map(&.to_i)
+t = ARGV[a + 2]
+puts((s..e).map { |n| t.gsub("{}", n.to_s) }.join(","))
\ No newline at end of file