Running luarocks without any argument gives an error that luarocks.config_cmd is missing.

[manjunaths]

When luarocks is run without any arguments, I get this error. The fix is to upgrade luarocks with

luarocks install luarocks

The error:

Error: LuaRocks scm bug (please report at https://github.com/keplerproject/luarocks/issues).
.../manju/torch/install/share/lua/5.1/luarocks/help.lua:77: module 'luarocks.config_cmd' not found:No LuaRocks module found for luarocks.config_cmd
no field package.preload['luarocks.config_cmd']
no file '/home/manju/torch/install/share/lua/5.1/luarocks/config_cmd.lua'
no file '/home/manju/torch/install/share/lua/5.1/luarocks/config_cmd/init.lua'
no file '/home/manju/.luarocks/share/lua/5.1/luarocks/config_cmd.lua'
no file '/home/manju/.luarocks/share/lua/5.1/luarocks/config_cmd/init.lua'
no file './luarocks/config_cmd.lua'
no file '/home/manju/torch/install/lib/lua/5.1/luarocks/config_cmd.lua'
no file '/home/manju/torch/install/lib/lua/5.1/luarocks/config_cmd/init.lua'
no file '/home/manju/torch/install/lib/luarocks/config_cmd.so'
no file '/home/manju/.luarocks/lib/lua/5.1/luarocks/config_cmd.so'
no file '/home/manju/torch/install/lib/lua/5.1/luarocks/config_cmd.so'
no file './luarocks/config_cmd.so'
no file '/home/manju/torch/install/lib/lua/5.1/loadall.so'
no file '/home/manju/torch/install/lib/luarocks.so'
no file '/home/manju/.luarocks/lib/lua/5.1/luarocks.so'
no file '/home/manju/torch/install/lib/lua/5.1/luarocks.so'
no file './luarocks.so'
no file '/home/manju/torch/install/lib/lua/5.1/loadall.so'
stack traceback:
[C]: in function 'require'
.../manju/torch/install/share/lua/5.1/luarocks/help.lua:77: in function <.../manju/torch/install/share/lua/5.1/luarocks/help.lua:44>
(tail call): ?
[C]: in function 'xpcall'
...orch/install/share/lua/5.1/luarocks/command_line.lua:202: in function 'run_command'
/home/manju/torch/install/bin/luarocks:35: in main chunk
[C]: ?

This bug had originally been raised here and they directed it to be filed against this project.