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BASH -- and ksh, and sh -- care about spaces in a few other places as well.

This is wrong:
if["this"="this"]
then
echo "strings are identical"
fi

This is okay:
if [ "this" = "this"...

Linux and UNIX don't care about the filename at all. They check the first few bytes in the file to see what it is.

All the top line does is tell the OS what shell to use.

If you want to use...