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diff --git a/noao/imred/hydra/demos/demos.cl b/noao/imred/hydra/demos/demos.cl
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+# DEMOS -- Run specified demo provided a demo file exists.
+
+procedure demos (demoname)
+
+file demoname {prompt="Demo name"}
+
+begin
+ file demo, demofile
+
+ if ($nargs == 0 && mode != "h")
+ type ("demos$demos.men")
+ demo = demoname
+ demofile = "demos$" // demo // ".cl"
+ if (access (demofile))
+ cl (< demofile)
+ else
+ error (1, "Unknown demo " // demo)
+end