datetimectl set-time "2016-11-01 12:06:26"

date +%F  或者 date +%Y+%m+%d

date -d"80 day ago" +"%F %H:%M:%S" > /mnt/datafile

date -d"-80 day ago" +"%F %H:%M:%S" >> /mnt/datafile

cat /mnt/date.txt | wc -c   字符  cat /mnt/date.txt | wc -m  行数 cat /mnt/date.txt | wc -l 单词数  cat /mnt/date.txt | wc -w

!date

touch westos{a..c}_file{8..13}

mv westos{a..c}_file{8..13} /tmp

vim /etc/vimrc

set nu  set mouse=a (设定鼠标可以操作光标位置)

groupadd -g 888 phone

useradd huawei

useradd -u 1800 mi -s /bin/sh

useradd -u 1801 -c User iphone

usermod -d /home/huawei huawei

usermod -u 1700 -s /sbin/nologin

usermod -c 苹果手机 iphone

usermod -d /home/huawei huawei

vim /etc/login.refs

PASS_MAX_DAYS=0

PASS_MIN_DAYS=7

visudo

99行 admin hostname=(root) NOPASSWD: /usr/sbin/useradd

mkdir /pubdir

chmod 1775 /pubdir

ps ax -o %cpu --sort -%cpu | grep -v CPU | head -n 5 > /mnt/pidfile

lastb | awk -F " " ‘{print $3}‘ | grep [1-9]

sed -e ‘79s/yes/no/g‘  /etc/ssh/sshd_config

tar zcf mnt.tar.gz /mnt/ -R

ssh-keygen

cd /root/.ssh

ssh-copy-id -i id_rsa.pub root@ip

scp id_rsa root@ip

scp mnt.tar.gz root@ip:/mnt

vim /etc/chronyd.conf

server 172.25.113.104 iburst

systemctl stop firewalld

systemctl restart chronyd

 timedatectl set-timezone Africa/Juba

服务端

echo "*.*  @172.5.113.104" /etc/rsyslog.conf

客户端

vim /etc/rsyslog.conf

$ModLoad imudp

$UDPServerRun 514

两边重起服务

systemctl restart rsyslogd

 connection add con-name eth0 ifname eth0  type ethernet ip4 172.25.254.113 gw4 172.25.254.254

yum install dhcpd -y

 cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf

vim /etc/dhcp/dhcpd.conf

subnet 172.25.113.0 netmask 255.255.255.0 {

  range 172.25.113.150 172.25.113.200;

  option routers 172.25.113.103;

}

mount /iso/rhel-server-7.1-x86_64-dvd.iso on /var/www/html/iso

mount -a

vim /etc/fstab

/iso/rhel-server-7.1-x86_64-dvd.iso    /var/www/html/iso    iso9660          ro,relatime  0 0

vim /etc/yum.repo/hcx.repo

[hcx]

name=hcx

baseurl=http://172.25.113.250:/iso

enabled=1

gpgcheck=0

yum clean all

yum repolist

yum install lftp

yum install vsftpd

yum remove vsftpd

Virsh脚本

#!/bin/bash

case "$1" in

        start|Start)

        virsh start $2

        ;;

        shutdown|poweroff)

        virsh destroy $2

        ;;

        undefine)

        virsh undefine $2

        ;;

        create)

        qemu-img create -f qcow2 -b /var/lib/libvirt/images/$2.img /var/lib/libvirt/images/$3.img

        virt-install \

        --name $3 \

        --ram 500 \

        --disk /var/lib/libvirt/images/$2.img \

        --import

        ;;

        *)

        echo "please use start:Start:shutdown:poweroff:undefine:create"

        ;;

esac

改变ip脚本

#!/bin/bash
echo "please input a disk(eth0)"
read disk
echo "please insput a number[0-255]:"
read number
if [ -z $number ]
then
        echo "please input a number[0-255]"

fi
ip addr show
source=172.25.113
HCX1=/etc/sysconfig/network-scripts/
cd $HCX1
echo "now positionis:"
pwd
if [ -e ifcfg-$disk ]
then
        sed  ‘/^IPADDR/d‘ ifcfg-$disk > ifcfg
        echo "IPADDR=$source.$number" >> ifcfg
        echo "GATEWAY=172.25.254.250" >> ifcfg
        echo "DNS1=172.25.254.250" >> ifcfg
        rm -fr ifcfg-$disk
        mv ifcfg ifcfg-$disk
else
        exit
fi
HCX2=yes
echo "please reboot(yes|no):"
read answer
if [ $answer=$HCX2 ]
then
        /etc/init.d/network restart
        sleep 2

else
        echo "This is need reboot"
fi

virt-install&&change ip