new shell function for man

data/man.json

@@ -4,6 +4,10 @@
     "shell": [
       {
         "code": "man man\n!/bin/sh\n"
+      },
+      {
+        "description": "This only works for GNU 'man' and requires GNU 'troff' to be installed.",
+        "code": "man '-H/bin/sh #' man\n"
       }
     ],
     "file-read": [
@@ -17,4 +21,4 @@
       }
     ]
   }
-}
+}