Run this command from a terminal window. This works on debian, ubuntu, and redhat. I’m sure it works on others but those are the only ones I have access to.

cat /proc/meminfo

You should see results similar to this:

MemTotal:      3615716 kB
MemFree:        132528 kB
MemShared:           0 kB
Buffers:         50028 kB
Cached:        1572772 kB
SwapCached:      80716 kB
Active:         580208 kB
Inactive:      1142848 kB
HighTotal:     2752384 kB
HighFree:         8576 kB
LowTotal:       863332 kB
LowFree:        123952 kB
SwapTotal:     2104504 kB
SwapFree:      1064540 kB
READ NEXT
Profile Photo for Lowell Heddings Lowell Heddings
Lowell is the founder and CEO of How-To Geek. He’s been running the show since creating the site back in 2006. Over the last decade, Lowell has personally written more than 1000 articles which have been viewed by over 250 million people. Prior to starting How-To Geek, Lowell spent 15 years working in IT doing consulting, cybersecurity, database management, and programming work.
Read Full Bio »
The above article may contain affiliate links, which help support How-To Geek.