brew install enca
find . -name "*.java" -exec enconv -L zh_CN -x UTF-8 {} \;

0 * * * * rsync -arv --delete /home/bluexiii/Documents/work /media/bluexiii/HITACHI/Documents
0 * * * * rsync -arv --delete --exclude=.git --exclude=.svn --exclude=node_modules --exclude=target /home/bluexiii/Documents/src /media/bluexiii/HITACHI/Documents

ssh-copy-id root@56.32.4.68

0 * * * * rsync -arv /home/minio/data root@56.32.4.68:/home/minio/data

systemctl reboot

systemctl poweroff

systemctl halt

systemctl suspend

systemctl hibernate

systemctl hybrid-sleep

systemctl rescue

systemd-analyze                                                                                       

systemd-analyze blame

systemd-analyze critical-chain

systemd-analyze critical-chain atd.service

hostnamectl

hostnamectl set-hostname xxxx

localectl

localectl set-locale LANG=en_GB.utf8
localectl set-keymap en_GB

timedatectl

timedatectl list-timezones                                                                                   

timedatectl set-timezone America/New_York
timedatectl set-time 2018-10-25 
timedatectl set-time 11:32:00

loginctl list-sessions

loginctl list-users

loginctl show-user root

systemctl list-units

systemctl list-units --all

systemctl list-units --all --state=inactive

systemctl list-units --failed

systemctl list-units --type=service

systemctl status

systemctl status bluetooth.service

systemctl -H root@rhel7.example.com status httpd.service

systemctl is-active application.service

systemctl is-failed application.service

systemctl is-enabled application.service

systemctl start apache.service

systemctl stop apache.service

systemctl restart apache.service

systemctl kill apache.service

systemctl reload apache.service

systemctl daemon-reload

systemctl show httpd.service

systemctl show -p CPUShares httpd.service

systemctl set-property httpd.service CPUShares=500

systemctl list-dependencies --all nginx.service

systemctl list-unit-files

systemctl list-unit-files --type=service

systemctl cat atd.service

journalctl

journalctl -k

journalctl -b
journalctl -b -0

$ sudo journalctl -b -1

journalctl --since="2012-10-30 18:17:16"
journalctl --since "20 min ago"
journalctl --since yesterday
journalctl --since "2015-01-10" --until "2015-01-11 03:00"
journalctl --since 09:00 --until "1 hour ago"

journalctl -n

journalctl -n 20

journalctl -f

journalctl /usr/lib/systemd/systemd

journalctl _PID=1

journalctl /usr/bin/bash

journalctl _UID=33 --since today

journalctl -u nginx.service
journalctl -u nginx.service --since today

journalctl -u nginx.service -f

journalctl -u nginx.service -u php-fpm.service --since today

0: emerg 1: alert 2: crit 3: err 4: warning 5: notice 6: info 7: debug
journalctl -p err -b

journalctl --no-pager

journalctl -b -u nginx.service -o json

journalctl -b -u nginx.service -o json-pretty

$ sudo journalctl --disk-usage

$ sudo journalctl --vacuum-size=1G

$ sudo journalctl --vacuum-time=1years

rpm -ivh postgresql11*

/usr/pgsql-11/bin/postgresql-11-setup initdb
or
postgresql-setup initdb

systemctl enable postgresql-11
systemctl start postgresql-11

listen_addresses = '*'

host    all all 0.0.0.0/0   md5

useradd kong;
su - postgres
psql 

CREATE USER kong; CREATE DATABASE kong OWNER kong;
CREATE USER kong WITH PASSWORD '123456';

psql -U kong -d kong -h 127.0.0.1 -p 5432 

rpm -ivh kong-1.2.1.el7.noarch.rpm

cp /etc/kong/kong.conf.defaul /etc/kong/kong.conf
vi /etc/kong/kong.conf

database = postgres              # Determines which of PostgreSQL or Cassandra
pg_host = 127.0.0.1             # The PostgreSQL host to connect to.
pg_port = 5432                  # The port to connect to.
pg_user = kong                  # The username to authenticate if required.
pg_password = 123456            # The password to authenticate if required.
pg_database = kong              # The database name to connect to.
pg_ssl = off                    # Toggles client-server TLS connections
pg_ssl_verify = off             # Toggles server certificate verification if

kong migrations bootstrap -c /etc/kong/kong.conf
kong start /etc/kong/kong.conf

CALL dbms.functions() YIELD name
WHERE name STARTS WITH 'apoc.'
RETURN count(name)
UNION
CALL dbms.procedures() YIELD name
WHERE name STARTS WITH 'apoc.'
RETURN count(name)

call apoc.help('meta');
call apoc.meta.graph();
call apoc.generate.ba(1000, 2, 'Person', 'FRIEND_OF');

ss -s

ss -lp

ss -a

ss -nltp|column  -t

ss -nltp|grep 18010

ip addr show
ip a

ip link set eth0 up
ip link set eth0 down

ip addr add 10.211.55.13/24 brd + dev eth0
ip addr del 10.211.55.13/24 dev eth0

ip route show

ip neigh

setenforce 0
sed -i 's/=enforcing/=disabled/g' /etc/selinux/config

systemctl disable firewalld.service
systemctl stop firewalld.service

yum -y install qemu-kvm libvirt virt-install bridge-utils 

systemctl start libvirtd
systemctl enable libvirtd

virt-install \
--virt-type=kvm \
--name=centos01 \
--vcpus=2 \
--memory=2048 \
--location=/tmp/CentOS-7-x86_64-Minimal-1511.iso \
--disk path=/home/vms/centos01.qcow2,size=40,format=qcow2 \
--network bridge=br0 \
--graphics none \
--extra-args='console=ttyS0' \
--force

virsh list              # 查看在运行的虚拟机
virsh list --all         # 查看所有虚拟机
virsh console centos72
virsh start centos72     # 虚拟机开启（启动）：
virsh reboot centos72    # 虚拟机重新启动
virsh shutdown centos72  # 虚拟机关机
virsh destroy centos72   # 强制关机（强制断电）
virsh suspend centos72   # 暂停（挂起）KVM 虚拟机
virsh resume centos72    # 恢复被挂起的 KVM 虚拟机
virsh undefine centos72  # 该方法只删除配置文件，磁盘文件未删除
virsh autostart centos72 # 随物理机启动而启动（开机启动）
virsh autostart --disable centos72 # 取消标记为自动开始（取消开机启动）

libvirt-client   # libvirt的客户端,最重要的功能之一就是在宿主机关机时可以通知虚拟机也关机  
gpxe-roms-qemu   # 虚拟机 iPXE 的启动固件,支持虚拟机从网络启动
libvirt-python   # libvirt 为 python 提供的 API
python-virtinst  # 一套 Python 的虚拟机安装工具
qemu-kvm         # KVM 在用户空间运行的程序
libvirt          # 用于管理虚拟机,它提供了一套虚拟机操作 API
virt-manager     # 基于 libvirt 的图像化虚拟机管理软件 
virt-viewer      # 显示虚拟机的控制台 Console
virt-top         # 类似于 top 命令,查看虚拟机的资源使用情况
virt-what        # 在虚拟机内部执行,查看虚拟机运行的虚拟化平台
qemu-img         # 用于操作虚拟机硬盘镜像的创建、查看和格式转化
qemu-kvm: 主要包含KVM内核模块和基于KVM重构后的QEMU模拟器. KVM模块作为整个虚拟化环境的核心工作在系统空间, 负责CPU和内存的调度. QEMU作为模拟器工作在用户空间, 负责虚拟机I/O模拟. 
依赖包 quemu-img:  主要用来QEMU磁盘镜像的管理, 如新建一块磁盘镜像给虚拟机. 
libvirt: 提供Hypervisor和虚拟机管理的API. 
libvirt-client: KVM客户端命令行管理工具virsh, 负责虚拟机的启动、停止和管理等.
libvirt-daemon: libvirtd守护进, 作为客户端管理工具跟Hypervisor和虚拟机之间的桥梁.
libvirt-daemon-driver-xxx: 从名字来看属于libvirtd服务的驱动文件, 作为libvirtd服务跟Hypervisor不同对象(如qemu模拟器、网络、存储等)间的接口.
bridge-utils: 网桥管理工具包, 负责桥接网络的创建、配置和管理等工作.
virt-install: 创建和克隆虚拟机的命令行工具包.
virt-manager: 图形界面的KVM管理工具.

yum install virt-manager
virt-manager

systemctl stop NetworkManager
systemctl disable NetworkManager

DEVICE=br0
TYPE=Bridge
BOOTRPOTO=static
IPADDR=10.211.55.11
NETMASK=255.255.255.0
GATEWAY=10.211.55.1
DNS1=10.211.55.1
ONBOOT=yes

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
#IPADDR=10.211.55.11
#PREFIX=24
#GATEWAY=10.211.55.1
#DNS1=10.211.55.1
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
NAME=eth0
UUID=9beea3d9-92ac-4f7f-b5eb-c8341f308a7d
ONBOOT=yes
DEVICE=eth0
BRIDGE=br0

yum install SDL-devel gcc kernel-devel
yum install ./VirtualBox-6.0-6.0.4_128413_el7-1.x86_64.rpm
vboxconfig

ssh -Y root@10.211.55.11
virtualbox

yum groupinstall "X Window System"
yum groupinstall "GNOME Desktop"

systemctl set-default multi-user.target  //设置成命令模式
systemctl set-default graphical.target  //设置成图形模式

ssh -Y root@10.211.55.11
startx
或
systemctl start gdm

vncpasswd

cp /lib/systemd/system/vncserver@.service  /etc/systemd/system/vncserver@:1.service

vi /etc/systemd/system/vncserver@\:1.service
将<USER>替换

systemctl daemon-reload
systemctl start vncserver@:1
systemctl status vncserver@:1
systemctl enable vncserver@:1