memo
s오래된파일삭제
find . -maxdepth 1 -type f -ctime +12 -delete;
용량
du -sch .[!.]* * |sort -h
PEM TO DER
openssl x509 -in dev.crt -outform der -out dev.der
openssl rsa -in dev.key -outform der -out dev.der.key
DNS FLUSH
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder