2023年3月29日 星期三

Bash built-in case modification

BASH 有內建大小寫轉換功能,執行效率會比使用 tr, sed, awk 好

$ A=ABCdef

# To upper case
$ echo ${A^^}
ABCDEF

# To lower case
$ echo ${A,,}
abcdef

沒有留言:

Fix Unable to detect release version (use '--releasever' to specify release version)

rpm -ivh https://mirror01.idc.hinet.net/CentOS/8-stream/BaseOS/x86_64/os/Packages/centos-gpg-keys-8-6.el8.noarch.rpm rpm -ivh https://mirror...