I'm only guessing here, but I think that the user that is
running the script is not able to see the file, while the
user that you are running the diagnostics under can.
An easy way to diagnose this is to 'su' to that user and
see if you can see those files in the shell. The harder
way is to dump a readdir() listing to STDERR.
This might be because a single directory somewhere along
that path is not mode 0755, but perhaps 0700 or somesuch.
In order to get into the final directory, you have to enter
each in turn.
As an aside, it is odd that you list the code
$HOME/$gamedir/maps/$mapname.bsp
in no fewer than three places in your code. If you were to
change one, for whatever reason, the other two would be
desynchronized (read: not working). A good idea is to warn
with the actual thing you were testing, not a simulation.
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