Limit User resources
1. As root:
vi /etc/security/limits.conf #add the following line, where steve is the user: sburke hard nproc 5 #save and close the text editor. #The user will not be able to run more than 5 processes at the same time.
2. ssh sburke@localhost
ps -eaf | grep sburke | ls /var/tmp | less -bash: fork: Resource temporarily unavailable