Quote:
1.none of the executable files I download work
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Which executables? What is the name of these files...
Typically you need to prepend "./" to the file to tell bash to run the command in the current directory, if it is not in your $PATH, however...if this was the case you would get a "not found" error, not silence.
You need to explain *exactly* what you're doing for us to troubleshoot this...