第八周

1、寫一個腳本，使用ping命令探測172.16.250.1-172.16.250.254之間的所有主機的在線狀態；

     在線的主機使用綠色顯示；

     不在線的主使用紅色顯示；

#!/bin/bash

#

for i in 172.16.250.{1..254};do

        if ping -c 6  $i &> /dev/null; then

                echo -e “\e[1;31m $i \e[0m”

        else

                echo -e “\e[1;32m $i \e[0m”

        fi

done

2、如何給網絡接口配置多個地址，有哪些方式？

(1)   ip addr add IFADDR dev IFACE

(2)   ifconfig IFACE_LABEL IPADDR/NETMASK

示例：

[root@localhost yum.repos.d]# ip addr show eth1

4: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000

    link/ether 00:0c:29:ca:38:36 brd ff:ff:ff:ff:ff:ff

[root@localhost yum.repos.d]# ip addr add 192.168.200.66/24 dev eth1

[root@localhost yum.repos.d]# ip addr add 192.168.200.99/24 dev eth1

[root@localhost yum.repos.d]# ifconfig eth1:0 192.168.200.132/24

[root@localhost yum.repos.d]# ip addr show dev eth1

4: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000

    link/ether 00:0c:29:ca:38:36 brd ff:ff:ff:ff:ff:ff

    inet 192.168.200.66/24 scope global eth1

    inet 192.168.200.99/24 scope global secondary eth1

    inet 192.168.200.132/24 brd 192.168.200.255 scope global secondary eth1:0

(3)編輯配置文件/etc/sysconfig/network-scripts/ifcfg-IFACE

注意：使用命令配置會立即有效，但不會永久有效。

   編輯完配置文件，需要重啟網絡服務，才會立即生效

3、寫一個腳本，完成以下功能

   (1) 假設某目錄(/etc/rc.d/rc3.d/)下分別有K開頭的文件和S開頭的文件若干；

   (2) 顯示所有以K開頭的文件的文件名，并且給其附加一個stop字符串；

   (3) 顯示所有以S開頭的文件的文件名，并且給其附加一個start字符串；

   (4) 分別統計S開頭和K開頭的文件各有多少；

#!/bin/bash

#

a=0

b=0

for i in $(ls /tmp/rc3.d) ;do

    echo $i > /tmp/1.txt

    if [ $(grep -o “^K” /tmp/1.txt ) == “K” ]  &> /dev/null;then

        echo   ${i}stop

        let a++  

    elif [ $(grep -o “^S”  /tmp/1.txt ) == “S” ]  &> /dev/null;then

        echo ${i}start

        let b++

    else

        echo $i

    fi

done

rm -rf /tmp/1.txt

echo “The number of files at the beginning of the K is: $a”

echo “The number of files at the beginning of the S is: $b”

4、寫一個腳本，完成以下功能

   (1) 腳本能接受用戶名作為參數；

   (2) 計算此些用戶的ID之和；

#!/bin/bash

#

if [ $# -lt 2 ];then

    echo “User name is at least two.”

        exit 2

fi

a=0

for i in $*;do

    if ! id $i &> /dev/null;then

        echo “$i is not exists.”

        exit 3

    else

        for j in $(id -u $i);do   

            j=$(($j+$a))

        done

        a=$j

     fi

done

echo   “The sum of $* id is: $a”

5、寫一個腳本

   (1) 傳遞一些目錄給此腳本；

   (2) 逐個顯示每個目錄的所有一級文件或子目錄的內容類型；

   (3) 統計一共有多少個目錄；且一共顯示了多少個文件的內容類型；

#!/bin/bash

#

if [ $# -lt 1 ];then

        echo “Directory numbers wrong.”

        exit 2

else

        for i in $*;do

                if  ! [ -d $i ];then

                        echo “$i is not directory.”

                        exit 3

                fi

        done

fi

dir=$(pwd)

a=0

x=0;xx=0;xxx=0;xxxx=0;xxxxx=0;xxxxxx=0;xxxxxxx=0

for j in $*;do

        cd $j

        for i in $(ls);do

                if [ -f $i ];then

                        echo “$i is common file.”

                        x=1

                elif [ -d $i ];then

                        echo “$i is directory.”

                        let a++

                        xx=1

                elif [ -L $i ];then

                        echo “$i is link file.”

                        xxx=1

                elif [ -b $i ];then

                        echo “$i is block file.”

                        xxxx=1

                elif [ -c $i ];then

                        echo “$i is character file.”

                        xxxxx=1

                elif [ -p $i ];then

                        echo “$i is pipeline file.”

                        xxxxxx=1

                elif [ -S $i ];then

                        echo “$i is socket file.”

                        xxxxxxx=1

                else

                        echo “$i Unkown.”

                fi

        done

done

cd $dir

echo “Directory:$a”

echo “Type:$(($x+$xx+$xxx$xxxx+$xxxxx+$xxxxxx+$xxxxxxx))”

6、寫一個腳本

  通過命令行傳遞一個參數給腳本，參數為用戶名

  如果用戶的id號大于等于500，則顯示此用戶為普通用戶；

#!/bin/bash

#

#!/bin/bash

#

if ! [ $# -le 1 ] ;then

        echo “arguments is wrong.”

        exit 2

elif ! id $1 &> /dev/null;then

        echo “user is not exists.”

        exit 3

else

        a=$(id -u $1)

fi

if [ $a -ge 500 ];then

        echo “$1 is general user. ”

else

        echo “$1 is system user or root”

fi

7、寫一腳本，用ping命令測試172.16.250.20-172.16.250.100以內有哪些主機在線，將在線的顯示出來；

#!/bin/bash

#

for i in 172.16.250.{20..100};do

        if ping -c 6  $i &> /dev/null; then

                echo $i

done

8、打印九九乘法表；

#!/bin/bash

for i in {1..9};do

        for j in $(seq  1 $i  );do

                echo -n -e  “$j*$i=$(($i*$j))\t ”

        done

        echo

done

i=1

while [ $i -le 9 ];do

        for j in $(seq 1 $i);do

                echo -n -e  “$j*$i=$(($i*$j))\t ”

        done

        echo

        let i++

done