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Q. How to find CentOS memory usage?

A. Memory Usage
The free command displays the total amount of physical memory and swap space for the system as well as the amount of memory that is used, free, shared, in kernel buffers, and cached.

# free

free [options]

# free -m
# free -k
# free -t
# free -l
# free -o
# free -s
# free -g

-b,-k,-m,-g show output in bytes, KB, MB, or GB
-l show detailed low and high memory statistics
-o use old format (no -/+buffers/cache line)
-t display total for RAM + swap
-s update every [delay] seconds
-c update [count] times
-V display version information and exit

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