4번독수리의 둥지

https://dev.mysql.com/doc/refman/8.0/en/charset-unicode-sets.html For any Unicode character set, operations performed using the xxx_general_ci collation are faster than those for the xxx_unicode_ci collation. For example, comparisons for the utf8mb4_general_ci collation are faster, but slightly less correct, than comparisons for utf8mb4_unicode_ci. The reason is that utf8mb4_unicode_ci supports ..

macos sed에서 파일 내용 교체가 안되고 파일 내용이 지워짐 sed 's/src/tar/g' file > file sed -i 's/src/tar/g' file 되는 방법 sed -i.bak 's/src/tar/g' file -> file.bak에 원래 내용을 백업하고 내용을 교체 참고 https://stackoverflow.com/questions/5694228/sed-in-place-flag-that-works-both-on-mac-bsd-and-linux

WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled. 설명... https://access.redhat.co..

$(cmd) substitutes the result of cmd as a string, whereas (cmd; cmd) run a list of commands in a subprocess. https://stackoverflow.com/questions/39110485

openssl ec -in ecprivkey.pem -pubout -out ecpubkey.pem openssl ec -in ecprivkey.pem -text -noout https://wiki.openssl.org/index.php/Command_Line_Elliptic_Curve_Operations