This blog post is 10 years old! Most likely, its content is outdated. Especially if it's technical.
Because I always forget, here's how to check if a file exists before attempting to delete it in bash:
[ -f foobar.html ] && rm foobar.html
If you don't do it this way and the file doesn't exist you get this:
rm: cannot remove `foobar.html': No such file or directory
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rm -f foobar.html will not complain if the file doesn't exist