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When using file:read_file(x) is it necessary to close the returned file?
{ok, File} = file:read_file("maillog.sample"),
file:close(File),
It is not a file, but the contents of the file that is returned.
Thus, no file to close.
Try changing the variable name to Data or similar as in the code below:
Data will then have the contents of the file “maillog.sample”.
The function file:read_file/1 will open, read and close the file for you, all in one go.