Manual:File System Functions

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Revision as of 09:50, 26 March 2017 by Vadi (talk | contribs) (→‎io.exists: fixed in 3.0)
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File System Functions

A collection of functions for interacting with the file system.

io.exists

io.exists()
Checks to see if a given file or folder exists.
If it exists, it’ll return the Lua true boolean value, otherwise false.
See lfs.attributes() for a cross-platform solution.
Example

<lua> -- This example works on Linux only if io.exists("/home/vadi/Desktop") then

 echo("This folder exists!")

else

 echo("This folder doesn't exist.")

end

-- This example will work on both Windows and Linux. if io.exists("/home/vadi/Desktop/file.tx") then

 echo("This file exists!")

else

 echo("This file doesn't exist.")

end </lua>

lfs.attributes

lfs.attributes(path)
Returns a table with detailed information regarding a file or directory, or nil if path is invalid / file or folder does not exist.
Example

<lua> fileInfo = lfs.attributes("/path/to/file_or_directory") if fileInfo then

   if fileInfo.mode == "directory" then
       echo("Path points to a directory.")
   elseif fileInfo.mode == "file" then
       echo("Path points to a file.")
   else
       echo("Path points to: "..fileInfo.mode)
   end
   display(fileInfo) -- to see the detailed information

else

   echo("The path is invalid (file/directory doesn't exist)")

end </lua>