OctOS: Allow specifying command to get help for with help command

octos/exec/help.lua

@@ -2,16 +2,28 @@
 
 local params = ...
 local bin    = get_userdata("bin")
+local param  = params[1]
 
-if params[1] == "all" then
-  for name, info in pairs(bin) do
-    local params = ""
-    if info.params then
-      params = " "..info.params
-    end
-
-    print(name..params..": "..info.description)
+-- [local function] Print help
+local function print_h(name, info)
+  local params = ""
+  if info.params then
+    params = " "..info.params
+  end
+
+  print(name..params..": "..info.description)
+end
+
+if param == "all" then
+  for name, info in pairs(bin) do
+    print_h(name, info)
+  end
+elseif not param or param == "" then
+  print("Specify a command to get help for or use help all to view help for all commands.")
+else
+  if bin[param] then
+    print_h(param, bin[param])
+  else
+    print(param..": command not found")
   end
-else
-  print("Specify a command to get help for or use help all to view help for all commands.")
 end