Three Linux Commands You Should Never Use
In this article we are going to cover three commands you should know, but you should never use. Yes Linux is a great tool and gives you great power, but with that great power comes great responsibility. So without further ado lets start.
01 - The Fork Bomb :(){ :|:& };:
A fork bomb (also called rabbit virus or wabbit) is a denial-of-service attack wherein a process continually replicates itself to deplete available system resources. This is a simple bash function which once executed creates copies of itself which in turn creates another set of copies of itself.
Linux process limits can be configured via /etc/security/limits.conf and PAM to avoid bash fork() bomb.
This examples can crash your system!
# Understanding :(){ :|:& };: fork() bomb code
foo(){
arg1=$1
arg2=$2
echo 'Bar..'
#do_something on $arg argument
}
02 - The Dev Null Command
In Linux there is a place like no place at all :) It's called /dev/null and everything you place there goes to a black hole. So in this example we are going to move our home directory in dev/null and that means that we are going to lose all the information we had.
# Destroy all information in root folder
mv /home/root/* dev/null
03 - The Give Me Power Chmod -R 777/ Command
This is a common error command that does not affect the system in general but creates a security breach in the operating system. In this case we give read and write permissions to everyone dus making the system like a yard without a fence.
# Give Me All the POWER
chmod -r 777/
Conclusion
There many more such examples, here we have learned about the most important thing -> we have to be careful while executing commands in Linux and we have to understand them!
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