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3 months agolooking at the code for btop it appears to just grab this information about memory usage out of /proc/meminfo directly, which you can cat yourself to look at. so if it’s wrong, it seems likely that it’s wrong because meminfo is mistaken in some way.
what you should do: delete that file and then listen to onlooker’s advice about using apt to install software when you can
what is happening: an arbitrary file you create to hold the contents of some data you streamed off the internet, for very good reason, is not automatically treated as an executable, partly because for all wget knows, it’s just a photograph or some text. to mark a file as executable, you need to run
chmod +x /path/to/script/fileto add to the file’s permissions. to learn more, and you should, please learn about file permissions and how those work on linux systems.