1、Ubuntu系统网络配置
1.1网卡名称的改变
root@ubunto:~# cat /etc/default/grub
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX="net.ifnames=0" //更改文件此行
#重新生成grub文件(1或2条命令都可)
root@ubunto:~# grub-mkconfig -o /boot/grub/grub.cfg
root@ubunto:~# update-grub
#重启生效
root@ubunto:~# reboot
root@ubunto:~# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.40 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::20c:29ff:fe5b:21ac prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:5b:21:ac txqueuelen 1000 (Ethernet)
RX packets 138 bytes 13477 (13.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 116 bytes 16396 (16.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
1.2主机名称的更改
#命令行修改
root@ubunto-aerver:~# hostnamectl set-hostname ubunto
#配置文件修改
root@ubunto:~# cat /etc/hostname
ubunto
1.3IP地址的配置
#修改网卡配置（配置静态ip）：
root@ubunto:~# cat /etc/netplan/00-installer-config.yaml
network:
ethernets:
eth0:
addresses:
- 192.168.10.40/24
gateway4: 192.168.10.1
nameservers:
addresses:
- 114.114.114.114
version: 2
#动态获取IP地址
root@ubuntu:~# cat /etc/netplan/00-installer-config.yaml
network:
version: 2
renderer: networkd
ethernets:
eth0:
dhcp4: yes
root@ubunto:~# netplan apply //是网卡配置文件生效
#查看IP地址：
root@ubunto:~# ifconfig eth0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.40 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::20c:29ff:fe5b:21ac prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:5b:21:ac txqueuelen 1000 (Ethernet)
RX packets 138 bytes 13477 (13.4 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 116 bytes 16396 (16.3 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
2、编写脚本实现登陆远程主机。（使用expect和shell脚本两种形式）
2.1基于expect实现远程主机的登陆
[00:16:53 root@client scripts]#cat expect.sh
#!/usr/bin/expect
set IP [lindex $argv 0]
set ROOT [lindex $argv 1]
set PASSWORD [lindex $argv 2]
spawn ssh $ROOT@$IP
expect {
"yes/no" { send "yes\n";exp_continue }
"password" {send "zhaofan\n" }
}
interact
[00:13:08 root@client scripts]#chmod +x expect.sh
[00:16:37 root@client scripts]#./expect.sh 192.168.238.30 root zhaofan
spawn ssh root@192.168.238.30
The authenticity of host '192.168.238.30 (192.168.238.30)' can't be established.
ECDSA key fingerprint is SHA256:HRMpG+eu5A0m/gLeeq6GrSzBR1i5Y5Y7SM97A5PUnLE.
ECDSA key fingerprint is MD5:af:28:43:c2:84:f0:19:e5:20:f8:42:08:99:08:98:57.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.238.30' (ECDSA) to the list of known hosts.
root@192.168.238.30's password:
Last login: Tue Apr 13 20:11:26 2021 from 192.168.238.2
#测试主机是否登陆成功
[20:17:12 root@router ~]#ifconfig ens34 | head -2
ens34: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.238.30 netmask 255.255.255.0 broadcast 192.168.238.255
2.2基于shell的远程主机登陆
[00:55:26 root@client scripts]#cat shell_expect.sh
#!/bin/bash
IP=$1
ROOT=$2
PASSWORD=$3
expect <<EOF
set timeout 20 //设置连接超时的时间
spawn ssh $ROOT@$IP
expect {
"yes/no" { send "yes\n";exp_contuine }
"password" { send "$PASSWORD\n" }
}
expect eof
EOF
[00:54:56 root@client scripts]#./shell_expect.sh 192.168.238.30 root zhaofan
spawn ssh root@192.168.238.30
root@192.168.238.30's password:
Last login: Tue Apr 13 20:54:15 2021 from 192.168.238.10
3、生成10个随机数保存于数组中，并找出其最大值和最小值
[19:17:30 root@centos8 scripts]#cat suijimax.sh
#!/bin/bash
declare -i min max
declare -a nums
for ((i=0;i<10;i++));do
nums[$i]=$RANDOM
[ $i -eq 0 ] && min=${nums[$i]} && max=${nums[$i]}&& continue
[ ${nums[$i]} -gt $max ] && max=${nums[$i]}
[ ${nums[$i]} -lt $min ] && min=${nums[$i]}
done
echo “All numbers are ${nums[*]}”
echo Max is $max
echo Min is $min
4、输入若干个数值存入数组中，采用冒泡算法进行升序或降序排序
[19:24:12 root@centos8 scripts]#cat numsort.sh
declare -a number
for (( i=0; i<20; i++ ));do
number[$i]=$RANDOM
done
echo "before sort:"
echo ${number[@]}
declare -i n=20
for (( i=0; i<n-1; i++ ));do
for (( j=0; j<n-1-i; j++ ));do
let next=$j+1
if (( ${number[$j]} < ${number[$next]} ));then
tmp=${number[$next]}
number[$next]=${number[$j]}
number[$j]=$tmp
fi
done
done
echo "after sort:"
echo ${number[*]}
echo "the max integer is ${number[0]},the min integer is ${number[$(( n-1 ))]}"
