Swap Space in Linux

How to check the swap file in linux:

root> swapon -s

Disk Usage :

root> df -m

Memory usage:

root> free -m

To create 1GB swap space

root> sudo dd if=/dev/zero of=/swapfile bs=1M count=1024 

root> sudo mkswap /swapfile 

root> sudo swapon /swapfile
root> /swapfile swap swap defaults 0 0

To Add additional Swap space:

root>  dd if=/dev/zero of=/extraswap bs=1M count=6144

root>  mkswap /extraswap

root> swapon /extraswap

root> vi /etc/fstab

/extraswap   none   swap   sw   0   0

Add the above Line.

Sort Disk usage :

du -H --max-depth=1 /home/user