root@debian129:~# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"
NAME="Debian GNU/Linux"
VERSION_ID="12"
VERSION="12 (bookworm)"
VERSION_CODENAME=bookworm
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
root@debian129:~# cat /etc/debian_version
12.9
root@debian129:~#
https://mirror.lzu.edu.cn/debian-cd/12.9.0/amd64/iso-dvd/debian-12.9.0-amd64-DVD-1.iso
sudo apt install -y ruby-full ruby-dev rubygems ;
#ruby -v
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-linux-gnu]
gem --version;
gem list;
gem env;
gem env | grep "RUBY VERSION";