Command to check swap partition size under Linux

Commands to check the size of swap partition under Linux
　　top
　　or fdisk -l
　　or free -m
　　SWAP partition is generally twice the size of physical memory, but the maximum size does not exceed 2G;
　　there are two ways to increase SWAP space: adding another SWAP partition, or Do this by creating a SWAP file.
　　1) Add a SWAP partition:
　　1) Create a SWAP partition: fdisk -l /dev/cciss/c0d0 (m---p ---n --t (convert the partition format to 82)--w) (such as /dev/cciss/c0d0p6)
　　2) Format the partition: mkswap -c v1 /dev/cciss/c0d06;
　　3) Modify the /etc/fstab file and add
　　/dev/cciss/c0d0p6 swap swap default 0 0
　　4) Activate the swap partition : swapon -a /dev/cciss/c0d0p6;
　　5) View swap partition: swapon -s or free or cat /proc/swaps
　　2) Add a SWAP file;
　　1) dd if=/dev/zero of=/tmp/tmp .swap bs=1M count =100; (create a 100M file);
　　2) mkswap /tmp/tmp.swap; (identified as a SWAP file)
　　3) swapon /tmp/tmp.swap; (activate the SWAP file)
　　4) Modify the /etc/fstab file and add the following:
　　/tmp/tmp.swap swap swap default 0 0
　　5) Check with swapon -s or free or cat /proc/swaps.
　　3) Delete the SWAP partition:
　　1) swapoff /dev/cciss/c0d0p6;
　　2) Modify the /etc/fstab file.