We all know that when you simply delete a file it's possible to recover it later. Sometimes this is useful, if you accidentally delete something important; but most of the time this is a problem, and you really want that file gone forever. This howto will explain how to delete a file in linux securely and permanently, so it can never be recovered.

When you delete a file, you are not really deleting it from your had drive. All the system does if free up the space occupied by that file to make room for other files and until that space is filled with new data, the files you tried to delete are actually still stored on your hard disk and can be recovered.

This tutorial will show you how to add a secure-delete option to the contextual menu in Ubuntu and Fedora Linux, but it can also be used as an example for adding any command to the right-click menu in Nautilus. We all know that when you simply delete a file, it’s possible to recover it later.

Deleting a file is a pretty simple task, right? Whether you’re in a GUI or on the command line, it’s really simple to delete a file. Once you’ve deleted it, it’s gone. Except - no it’s not.

When you use the "rm" utility, you may think that you're deleting a file, but you're not. All you're doing is removing the file's index--or, inode number--from the hard drive. The file is still there, and can still be recovered, as long as you don't overwrite the space that it occupies with another file. (Even then, recovery experts still might be able to retrieve it.)

Shred utility overwrites a file to hide its contents, and optionally delete it if needed. The idea is pretty simple as it overwrites the specified FILE(s) repeatedly, in order to make it harder for even very expensive hardware probing to recover the data. By default file is overwritten 25 times.

Deleting a file or reformatting a disk does not destroy your sensitive data. The data can easily be undeleted. That's a good thing if you accidentally throw something away, but what if your trying to destroy financial data, bank account passwords, or classified company information. In this article you will learn number of tools to delete files securely in ubuntu Linux

If you want to delete a record from any MySQL table then you can use the delete command. The delete command is very similar to the update command.

delete from table where where_condition;

The delete statement deletes rows from a table.
The table is the table name.
The where clause specifies the conditions that identify which rows to delete.

Typing the wrong command can severely cripple your computer. A wrong switch or wrong option is all it takes. One command that I learned to avoid a long time ago, based on what experienced users told me, is rm -rf /. The rm command is what you use to remove or delete a file or directory.