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awk?atopsar -r /var/log/atop/atop_20170512 -m -R 1 | sed 1,6d | awk '{print $3}' | sed 's:M::g' | sed 's:[^0-9]*::g'| awk 'NF' | sort -n | head -n 1memfreeis not 'correct', I don't know how it's calculated, but even in days without heavy load on server it shows about only 30% of memory free.free -mand compare "free memory" with "available memory":daniel@trucka:~$ free -mtotal used free shared buff/cache availableMem: 1888 312 734 17 840 1496Swap: 2047 0 2047As you can see in my example: there is 1496M of memory available, but 840 are currently used for caches (which is fine).