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Using the cat Command To Hide Files Inside Other Files

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I found this from : http://filthypants.blogspot.com/2008/01/using-cat-command-to-hide-files-inside.html

Using the cat Command To Hide Files Inside Other Filescat is a standard command from Unix operating systems, such as BSD and Mac OS X, and Unix-like operating systems, such as Linux, that can be used to concatenate and display files. In this tutorial, I'm going to teach you how to hide any file inside any other file using cat, such that no one will every know the hidden file is there. This obviously has a number of uses, including providing another layer of protection for sensitive information such as bank numbers, personal information, etc.

WARNING: this is an advanced trick that requires the use of the command line. If you are scared of using the command line, don't bother continuing.

Ok, now that that's out of the way, pick a file you want to hide and another file you want to hide it in and place both files on your desktop. In my case, I'm going to hide an archive
in…