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Using `ls -lastr` would give you a decent list of file properties. The "hidden" files in linux are typically called "dot files". If you preceed the filename with a dot (as in .fileName), it would "hide" from the default `ls` command.
The -a flag of the ls command would find all dot files, so in effect they aren't really hidden. However, you could probably effectively hide a file by prefixing the filename with nongraphic characters. Although the -b flag of `ls` would print octal escapes in the place of the nongraphic character... The use of -b is not as commonly known as -a.
When in doubt, encrypt the file and change ownership and permissions.
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"There are a thousand hacking at the branches of evil to one who is striking at the root."
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