Reclaim some memory on Mac OS

This is a recurring issue for me, having not enough memory on my Mac, so here are some useful commands:

Display how much the memory is used by processes, reclaim some and verify again:

ps -axm -o "rss,comm" | awk 'BEGIN { s=0;}; {s=s+$1;}; END { printf("%.2f GB\n", (s/1024.0/1024));}'
purge
ps -axm -o "rss,comm" | awk 'BEGIN { s=0;}; {s=s+$1;}; END { printf("%.2f GB\n", (s/1024.0/1024));}'
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