sysctl 로 커널 변수 조회하기
$ sysctl -a | head -10
user.cs_path: /usr/bin:/bin:/usr/sbin:/sbin
user.bc_base_max: 99
user.bc_dim_max: 2048
user.bc_scale_max: 99
user.bc_string_max: 1000
...
net.inet.ip.ttl: 64
net.inet.ip.rtexpire: 10
net.inet.ip.rtminexpire: 10
net.inet.ip.rtmaxcache: 128
...
machdep.cpu.cache.linesize: 64
machdep.cpu.cache.L2_associativity: 4
machdep.cpu.cache.size: 256
...
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