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This article introduces what are the most dangerous commands commonly used in Linux, the content is very detailed, interested friends can refer to, I hope it can be helpful to you.

Rm-rf command

The rm-rf command is one of the fastest ways to delete a folder and its contents. Even the slightest mistake or ignorance can lead to the collapse of an irreversible system.

R: recursively delete folder

F: delete the "read-only file" without asking. Deleting a file under Linux does not care whether the file is read-only, but whether its parent directory has write permission. So the parameter-f just means that you don't have to delete the confirmation one by one, but delete it all quietly. In addition, the original rm command actually does not delete the prompt, but the general distribution will add the rm alias to the-I parameter to request deletion confirmation, while-f suppresses the prompt.

Mv folder / dev/null

This command moves a "folder" to / dev/null. In Linux, the / dev/null or null device is a special file, and all data written to it is erased and a successful write operation is returned. The data output to / dev/null can only be recovered through the recovery software.

> file

> the file command is often used to clear the contents of a file. Make sure that the output file is empty or does not exist before execution, otherwise the original file cannot be recovered if the command is executed, and even the data recovery software may not be able to help you. Another thing you might really want to use is > > file, which accumulates new output to the file, rather than refreshing that file with > file. If you execute the > xxx.conf command incorrectly or ignorantly, it will overwrite the configuration file or any other system configuration file.

Command > / dev/sda

The command > / dev/sda command writes the output of a "command" to the block device / dev/sda. This operation replaces all data blocks in the block device with the original data written by the command, resulting in data loss for the entire block device.

There are other very dangerous commands in linux, such as the format command mkfs.ext3 / dev/sda. But these commands are relatively unpopular. But the four commands listed above are often used as developers, so you must use them carefully and make sure you make a clear backup before using them, or it will be too late.

Which of the most dangerous commands about Linux are shared here, I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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