free

command hardware

Display amount of free and used memory

Required Packages

sudo apt install -y procps

Options

Human-readable output (-h) Human-readable output (-h)

Show sizes in KB/MB/GB

Wide output (-w) Wide output (-w)

Show buffers and cache separately

Show total (-t) Show total (-t)

Display a total line for RAM + swap

Repeat interval (-s)

Repeat every N seconds (continuous monitoring)

Repeat count (-c)

Number of repetitions (use with -s)

Show low/high memory stats (-l) Show low/high memory stats (-l)

free -h