free

Display amount of free and used memory.

$ free -h

Unit

Auto

Bytes

Human-readable (-h)Show totals (-t)Wide output (-w)Power of 1000 (--si)

Repeat interval (-s)

Examples

# Default display
free

# Human-readable
free -h

# With totals
free -ht

# Repeat every 5 seconds
free -s 5

# In megabytes
free -m

# Wide format
free -w