Memory

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$ free -m

cat /proc/meminfo

vmstat

top => press M to sort by memory % usage.
smem

htop

atop

ps aux --sort '%mem'
ps aux | awk '{print $2, $4, $11}' | sort -k2rn | head -n 10
ps -e -orss=,args= | sort -b -k1,1n | pr -TW$COLUMNS