File descriptors?

File descriptors 0, 1 and 2 are for stdin, stdout and stderr respectively.

It's failing because those file descriptors don't point to anything! The normal default file descriptors are the standard input 0, the standard output 1, and the standard error stream 2. Since your script isn't opening any other files, there are no other valid file descriptors.

You can open a file in bash using exec. Here's a modification of your example.

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