??查看系统中有哪些用户： cut -d : -f 1 /etc/passwd
查看可以登录系统的用户： cat /etc/passwd | grep -v /sbin/nologin | cut -d : -f 1
yum list | grep openssh-server
vim /etc/ssh/sshd_config
restart ssh
ssh root@localhost
yum list | grep openssh-client
ssh -p 22 root@localhost
tree --charset ASCII
VirtualBox中安装CentOS 7后无法上网问题
打开linux系统，输入
vi /etc/sysconfig/network-scripts/ifcfg-enp0s3
打开网卡配置文件（可能你的不是这个文件，但是没关系只要是/ifcfg-exxx就行），将“ONBOOT=NO”修改为“yes”
添加主机名：
# hostname nginx-web01
# vim /etc/sysconfig/network
HOSTNAME= nginx-web01
# vim /etc/hosts
127.0.0.1 nginx-web01
还有一种终极修改：
# echo "kernel.hostname = nginx-web01" >> /etc/sysctl.conf
# sysctl -p
ctrl +s 锁住当前终端
ctrl +q 当当前终端解锁
v-jiachunyan
Sino+3321
在VI/VIM中快速保存
如果你很匆忙，你可以通过"shift + zz"快速地从vim的插入模式中退出。
CentOS 7基础Java开发环境JDK, Maven, Tomcat, MySQL,Redis
https://blog.51cto.com/13721885/2147464
安装桌面：
yum groupinstall "X Window System"
yum grouplist
yum groupinstall "GNOME Desktop" "Graphical Administration Tools"
startx
鸟哥的Linux私房菜基础版笔记：
/etc/passwd
man man
info info
man -help
man --help
df [-h]
du [-c -s -h]
grep -n the test.sh
useradd -D
useradd [-m] test
userdel [-r] test
usermod -G shared tom
usermod -g shared tom
useradd -m tom -g shared -p tom
chown tom note
chown tom.shared note
chown .shared note
chown tom. note # if condition
#only root can change the shuzhu,every owner can change the shuzu
umask
umash 026
cat /etc/passwd
cat /etc/group
aptitude
aptitude show mysql-client
dpkg -L mysql-client
dpkg --search absolute_file_name
aptitude search wine
aptitude install wine
aptitude safe-upgrade
aptitude purge wine
aptitude remove wine
/etc/apt
su-
yum list installed
yum list installed xterm
yum install package_name
yum repolist all
yum localinstall package_name.rpm
yum list updates
yum update package_name
yum update
yum remove pageage_name
yum erase package_name
yum clean all
yum deplist package_name
yum update --skip-broken
alias vi
which vi
readlink -f /usr/bin/vi
``
$(date)
$(date +%y%m%d)
command > outputfile
command >> outputfile
wc < filename
expr 7+2 #false
expr 7 + 2 #true
expr 7 \* 2
echo $[2+3] #true
echo $[2*3] #true
uname -a
cat /proc/version
cat /etc/issue
mysql_secure_installation
locale
fdisk -l /dev/sda
dd if=/root/CentOS-7-x86_64-Everything-1804.iso of=/dev/sdb #for centos system,make start data
1、centos6的网卡重启方法：service network restart
centos7的网卡重启方法：systemctl restart network
2、DNS配置文件：cat /etc/resolv.conf
设置主机和IP绑定信息：cat /etc/hosts
设置主机名：cat /etc/hostname
