第十份学习报告

1、Ubuntu系统网络配置总结（包括主机名、网卡名称、网卡配置）

修改主机名
hostnamectl??set-hostname??ubstudy

修改网卡名称
vim?/etc/default/grub
GRUB_CMDLINE_LINUX="net.ifnames=0"
然后配置生效
grub-mkconfig?-o?/boot/grub/grub.cfg

网卡配置
配置静态地址
vim??/etc/netplan/01-netcfg.yaml
network:
version:?2
renderer:?networkd
ethernets:
??eth0:
????addresses:?[10.0.0.4/8]
????gateway4:?10.0.0.1
????nameservers:
????addresses:?[10.0.0.1，8.8.8.8]

2、编写脚本实现登陆远程主机。（使用expect和shell脚本两种形式）。

expect模式
vim???expect.ept
set?user??[lindex?$argv?0]
set?ip?[lindex?$argv?1?]
set?passwd?[lindex?$argv?2]
spawn??ssh?$user@$ip
expect?{
????????"yes/no"?{?send?"yes\n";exp_continue?}
????????"password"?{send?"$passwd\n"}
}
interact
?[root@oracle_machine_1?~]#??./expect.ept?root?10.0.0.3?123456
spawn?ssh?root@10.0.0.3
root@10.0.0.3‘s?password:
Last?login:?Fri?May?21?19:32:42?2021?from?10.0.0.2
[root@oracle_machine_2?~]#?hostname
oracle_machine_2
[root@oracle_machine_2?~]#

shell?模式
vim?ssh.sh
read?-p?"please?input?ip:"?IP
read?-p?"please?input?user:"?USER
read?-p?"please?input?password:"?PASSWD
expect?<<EOF
set?time_out?5
spawn?ssh?$USER@$IP
expect?{
????????"yes/no"?{?send?"yes\n";exp_continue?}
????????"password"?{?send?"$PASSWD\n";exp_continue?}
}
expect??"~]#"??{?send?"hostname?\n"?}
expect?eof
EOF

[root@oracle_machine_1?~]#?./ssh.sh?
please?input?ip:10.0.0.3
please?input?user:root
please?input?password:123456
spawn?ssh?root@10.0.0.3
root@10.0.0.3‘s?password:?
Last?login:?Fri?May?21?15:24:41?2021?from?10.0.0.2
[root@oracle_machine_2?~]#?hostname?
oracle_machine_2

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

vim?max_min.sh
#!/bin/bash
declare?-i?min?max
declare?-a?num
for?((i=0;i<10;i++));do
???????num[$i]=$RANDOM
???????[?$i?-eq?0?]?&&?min=${num[$i]}?&&?max=${num[$i]}?&&?continue
???????[?${num[$i]}?-gt?$max?]?&&?max=${num[$i]}
???????[?${num[$i]}?-lt?$min?]?&&?min=${num[$i]}
done
echo?"all?numbers?are?${num[*]}"
echo?"the?max?number?is?$max?,the?min?number?is?$min"

[root@oracle_machine_1?~]#?./max_min.sh
all?numbers?are?11596?1687?14146?29255?13420?12497?10018?18805?13280?20314
the?max?number?is?29255?,the?min?number?is?1687

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

随机数值排序

[root@oracle_machine_1?~]#?vim?nums.sh
#!/bin/bash
#Author:root
#phone-number:
#Version:1.0
#CreateTime:2021-05-21?15:53:32
#Description:
declare?-a?nums
declare?-i??zh
read?-p?"please?input?number?of?random?numbers(3-20):"?num
if?[?$num?-lt?20?]?&?[?$num?-gt?2?]
then
for?((i=0;i<$num;i++))do
???????nums[$i]=$RANDOM
done
echo?"the?array?are?${nums[*]}"
for?((k=0;k<$num;k++))do
???????for?((j=k;j<$num;j++))do
???????[?${nums[$k]}?-le?${nums[$j]}?]?||?zh=${nums[$k]}?nums[$k]=${nums[$j]}?nums[$j]=$zh
done
done
echo?"this?is??Ascending??sort?,the?array?are?${nums[*]}"
for?((k=0;k<$num;k++))do
???????for?((j=k;j<$num;j++))do
???????[?${nums[$k]}?-ge?${nums[$j]}?]?||?zh=${nums[$k]}?nums[$k]=${nums[$j]}?nums[$j]=$zh
done
done
echo?"this?is??descending??sort?,the?array?are?${nums[*]}"
else
echo?"the?numbers?is?wrong,please?input?correct?numbers"
fi

[root@oracle_machine_1?~]#?./nums.sh
please?input?number?of?random?numbers(3-20):10
the?array?are?17089?6000?27944?3896?25470?5997?11533?21084?12028?22342
this?is??Ascending??sort?,the?array?are?3896?5997?6000?11533?12028?17089?21084?22342?25470?27944
this?is??descending??sort?,the?array?are?27944?25470?22342?21084?17089?12028?11533?6000?5997?3896

确定数值排序

[root@oracle_machine_1?~]#?cat?num.sh
#!/bin/bash
#Author:root
#phone-number:
#Version:1.0
#CreateTime:2021-05-21?15:53:32
#Description:
declare?-a?nums
declare?-i?zh?a?b
c=1
PS3="please??choose?sort?method:"
select?MENU?in?Ascending?descending?exit;do
case?$REPLY?in
1)
??a=0
??while?true?;?do
??read?-p?"please?input?your?number?or?input?1?to?sort:"?num
??if?[?$num?-eq?$c?]
then
echo?${nums[*]}
break
fi
??nums[$a]=$num
??a=++a
done
for?((k=0;k<a;k++))do
???for???((j=k;j<a;j++))do
????????[?${nums[$k]}?-le?${nums[$j]}?]?||?zh=${nums[$k]}?nums[$k]=${nums[$j]}?nums[$j]=$zh
??????done
done
echo?"this?is??Ascending??sort?,the?array?are?${nums[*]}"
break
;;
2)
??b=0
??while?true?;?do
??read?-p?"please?input?your?number?or?input?1?to?sort:"?num
if?[?$num?-eq?$c?]
then
echo?${nums[*]}
break
fi
??nums[$b]=$num
??b=++b
done
for?((k=0;k<b;k++))do
???for???((j=k;j<b;j++))do
????????[?${nums[$k]}?-ge?${nums[$j]}?]?||?zh=${nums[$k]}?nums[$k]=${nums[$j]}?nums[$j]=$zh
??????done
done
echo?"this?is??Ascending??sort?,the?array?are?${nums[*]}"
break
;;
3)
break
;;
*)
echo?"this?is?error"
;;
esac
done

[root@oracle_machine_1?~]#?./num.sh?
1)?Ascending
2)?descending
3)?exit
please??choose?sort?method:1
please?input?your?number?or?input?1?to?sort:4
please?input?your?number?or?input?1?to?sort:5
please?input?your?number?or?input?1?to?sort:2
please?input?your?number?or?input?1?to?sort:1
4?5?2
this?is??Ascending??sort?,the?array?are?2?4?5
[root@oracle_machine_1?~]#

第十份学习报告

原文：https://blog.51cto.com/u_12545047/2801242