[LINUX] See here for the amount of free memory of the free command

Option: -m (MB notation)

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reference

Notes on checking free memory with the free command | SUSE [Linux memory management (insufficient memory ?, detection / prevention of memory leaks) (Kodama's tips page)](http://www.math.kobe-u.ac.jp/HOME/kodama/tips-free -memory.html) [Investigate server load status (vmstat, free, top, proc, ps) | Site that makes full use of 100% rental server](https://go-journey.club/archives/2912#I/O%E8%B2 % A0% E8% 8D% B7% E3% 81% 8C% E9% AB% 98% E3% 81% 8F% E3% 81% AA% E3% 82% 8B% E5% 8E% 9F% E5% 9B% A0 )

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