Linux Amazing Keypresses & Commands : Set 5

• Finding the top 20 processing in consuming the RAM.

$ps aux | awk '{print $2, $4, $11}' | sort -k2rn | head -n 20

This command will list the top 20 process in decreasing order of their RAM consumption. It will be more helpful if you add a alias this command. Another solution for it is htop.
Install htop. For Fedora/RedHat users.

$yum install htop

For Ubuntu users.

$sudo apt-get install htop

For sorting the processes run htop & type
M for RAM
P for CPU
T for TIME
To invert the processes type I.