Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.
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A long listing of the root directory, /, is used for input. Create a file holding sed commands that check for symbolic links and plain files. If a file is a symbolic link, precede it with a line "--This is a symlink--". If the file is a plain file, add a string on the same line, adding a comment like "<--this is a plain file".
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