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Lua-Api
Input/Output
[LUA 5.1] io.type
function io.type ( obj )
Checks whether obj is a valid file handle.
Returns the string "file" if obj is an open file handle, "closed file" if obj is a closed file handle, or nil if obj is not a file handle.
Returns the string "file" if obj is an open file handle, "closed file" if obj is a closed file handle, or nil if obj is not a file handle.