How to see how much you have swap by Matlab prompt in your system?

I would like to verify how much users have swap on their system by one-liner. Is there anything about the thing in Matlab prompt?

OS: Debian 8.5 64 bit Linux kernel: 4.6 of backports Hardware: Asus Zenbook UX303UA

Answer 1

[Walter Roberson]

No, this cannot be done in one line. Figuring out how much swap you have available requires detecting which OS-X version you are running. Current versions of OS-X would require asking the system for sysctl vm.swapfileprefix , removing the filename portion, resolving that directory to a device, and asking for the amount of free space on the device, together with totaling the size of all existing files that match the pattern starting with sysctl vm.swapfileprefix . Remember when you ask for the amount of free space on the partition to multiply by the blocksize to get bytes, because the file sizes will be in bytes.

[SL]

You can assume that I run Debian 8.5. You can also use a few lines.

[Walter Roberson]

http://www.cyberciti.biz/faq/linux-check-swap-usage-command/ and some different phrasing at http://www.tecmint.com/commands-to-monitor-swap-space-usage-in-linux/

So perhaps

!free -h | awk '/Swap:/ {print $4}'