wmic

wmic path softwarelicensingservice get OA3xOriginalProductKey

GRUB Boot config

cd /etc/grub.d
sudo vi 40_custom
menuentry “OS_Name” {
set root=(hd0,1)
chainloader +1
}
Save File
grub2-mkconfig –output=/boot/grub2/grub.cfg
Edit Grub Default
vi /etc/default/grub:
GRUB_DEFAULT=”OS_Name”
~

opera

rpm --import https://rpm.opera.com/rpmrepo.key

tee /etc/yum.repos.d/opera.repo <<REPO [opera] name=Opera packages type=rpm-md baseurl=https://rpm.opera.com/rpm gpgcheck=1 gpgkey=https://rpm.opera.com/rpmrepo.key enabled=1 REPO

yum -y install opera-stable

calibre

wget -nv -O- https://download.calibre-ebook.com/linux-installer.sh | sudo sh /dev/stdin version=3.48.0