Centos 7

one one one
one one one
one one one
one one one
one one one
one one one





#add MATE GUI to centos#
yum install -y redhat-lsb-core net-tools epel-release kernel-headers kernel-devel
yum groupinstall -y "Development Tools"
yum groupinstall -y "X Window system" "MATE Desktop"
systemctl set-default graphical.target
systemctl isolate graphical.target


#add GNOME GUI to centos mini
yum grouplist
yum groupinstall "GNOME Desktop"
yum groups install "Server with GUI"
asd asd asd asd
systemctl asd sdaaaa set-default graphical.target
asd asd asd asd 
systemctl isolate graphical.target

#utils

cat
less
head
tail

cat > file <<END ... END -> heredoc

tar -cf bin.tar bin -> just archive
tar -czf bin.tar.gz bin -> zip archive

gzip bin.tar
bzip bin.tar

cpio

#####recover root password########
1. interapt boot menu
2. remove `rhgb` `quit`
3. add `rd.break` `enforcing=0`
4. mount -o remount,rw /sysroot
5. chroot /sysroot
6. passwd ...
7. exit #go to switch_root
8. mount -o remount,ro /sysroot
9. exit
10.restorecon /etc/shadow
11.setenforce 1