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I have myfile.txt sitting in the same directory as my lua file, yet when I call io.input("myfile.txt") I get the error bad argument #1 to 'input' (myfile.txt: No such file or directory).

I don't see how this can be going wrong, have I misunderstood Lua's I/O?

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You need to fully qualify the path (eg. "/home/username/myfile.txt" on *NIX, "C:\directory\myfile.txt" on Windows). When you don't, the Lua interpreter expects the file to be in the same directory as the interpreter.

Read this question for an easy fix using arg[0] to get the current directory of the script being executed.

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Thank you! However, I'm executing this code use Love2d, which might put a bit of a spanner in the works regarding getting the current directory. Any suggestions?
If Love2d doesn't give you a way to load resources itself then I would hope it gives you a way to get your base directory location.
If you're using Love2d, I strongly suggest you use the API function, love.filesystem.read (love2d.org/wiki/love.filesystem.read)

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