shell练习题

一、写一个脚本,给脚本传递两个参数,显示二者之和和二者之积shell

#!/bin/bash #写一个脚本,给脚本传递两个参数,显示二者之和和二者之积
read -p "请输入第一个数:" num1 read -p "请输入第二个数:" num2 echo $[$num1+$num2] echo $[$num1*$num2]

二、写一个脚本,能接受一个参数(文件路径),判断这个参数若是是一个存在的文件就显示“ok”,不然显示“No such file"bash

#!/bin/bash
 read -p "请输入一个文件路径:" filename if [ -e $filename ];then echo "OK"
else echo "No such file" fi

三、判断/etc/inittab文件是否大于100行,若是大于,则显示”/etc/inittab is a big file.”否者显示”/etc/inittab is a small file.”网络

#!/bin/bash
 Line=`wc -l /etc/inittab | cut -d" " -f1` if [ $Line -gt 100 ];then echo "/etc/inittab is a big file."
else echo "/etc/inittab is a small file." fi

四、给定一个用户,来判断这个用户是什么用户,若是是管理员用户,则显示“该用户为管理员”,不然显示“该用户为普通用户”。ui

#!/bin/bash
a=`whoami` str="root"
if [ $a = $str ];then echo "该用户为管理员"
else echo "该用户为普通用户" fi

五、判断某个文件是否存在spa

#!/bin/bash
 read -p "输入查找的文件名:" filename find $filename &> /dev/null if [ $? -eq 0 ];then echo "这个文件存在"
else echo "这个文件不存在" fi

六、写出一个脚本程序,给定一个文件,好比:/etc/inittabcode

     a、判断这个文件中是否有空白行?blog

     b、若是有,则显示其空白行的行号,不然显示没有空白行。ip

#!/bin/bash
  2 b=`grep -n "^[[:space:]]*$" /etc/inittab | wc -l` 3 
  4 c=`grep -n "^[[:space:]]*$" /root/kongbai | cut -d: -f1` 5 if [ $b -eq 0 ];then 6         echo "没有空白行"
  7         exit 1
  8 else
  9         echo "有空白行,空白行为$c行"
 10 exit 0 11 fi

七、判断用户的默认shell程序是否为bash程序,有就显示有多少个,没有就显示:没有这类用户。内存

1 #!/bin/bash
  2 # Author: 张琦妮
  3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-11 15:57:34
  5 # Name: panduan.sh
  6 # Version: v1.0
  7 # Description: This is a Script.
  8 declare -i sum=`grep "bin/bash$" /etc/passwd | wc -l` 9 if grep "/bin/bash$" /etc/passwd &> /dev/null;then 10         echo "存在 $sum 个用户,shell程序为/bin/bash"
 11         grep "/bin/bash$" /etc/passwd | cut -d: -f1 12 exit 0 13 else
 14         echo "没有这类用户"
 15         exit 1
 16 fi

八、判断历史命令总条目是否大于1000,大于显示“some command will gone”,不然显示OK。it

1 #!/bin/bash
  2 # Author: 张琦妮
  3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-11 16:06:04
  5 # Name: history.sh
  6 # Version: v1.0
  7 # Description: This is a Script.
  8 
  9 declore -i num 10 
 11 num=`history | wc -l` 12 
 13 if [ $num -gt 30 ];then 14         echo "some command will gone"
 15 exit 0 16 else
 17         echo "OK"
 18         exit 1
 19 fi

 九、给定一个文件,若是是普通文件和目录文件,就显示出来,不然显示“没法识别”。

1 #!/bin/bash 2 # Author: 张琦妮 3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-11 16:39:33
  5 # Name: wenjian.sh 6 # Version: v1.0
  7 # Description: This is a Script. 8 
  9 read -t 50 -p "请输入一个文件:" filename 10 
 11 if [ -z $filename ];then 12         echo "eg./etc/fstab"
 13         exit 8
 14 fi 15 
 16 if [ -f $filename ];then 17         echo "$filename 是一个普通文件"
 18         exit 0
 19 elif [ -d $filename ];then 20         echo "$filename 是一个目录文件"
 21 else
 22         echo "没法识别"
 23         exit 1
 24 fi

 十、输入一个设备文件,输出这个设备文件的基本信息。

1 #!/bin/bash 2 # Author: 张琦妮 3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-12 17:09:59
  5 # Name: shebei.sh 6 # Version: v1.0
  7 # Description: This is a Script. 8 
  9 read -t 50 -p "输入设备文件名:" devname 10 [ -z $devname ] && devname=`fdisk -l` && exit 1
 11 
 12 if [ -b /dev/$devname ];then 13         fdisk -l /dev/$devname 14         exit 0
 15 else
 16         echo "$devname 不是设备文件"
 17         echo "Usage:'请输入一个设备文件,如sda'"
 18         exit 2
 19 fi

 十一、判断文件是否存在,若是存在输出是什么文件。

1 #!/bin/bash 2 # Author: 张琦妮 3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-13 10:40:27
  5 # Name: ceshipanduan.sh 6 # Version: v1.0
  7 # Description: This is a Script. 8 
  9 read -p "输入一个文件名:" name 10 if [ -z $name ];then 11         echo "Usage:'输入一个文件名:/etc/fstab"
 12         exit 1
 13 fi 14 
 15 if [ ! -e $name ];then 16         echo "提示:输入的文件不存在!!!"
 17         exit 2
 18 elif [ -f $name ];then 19         echo "$name is a file."
 20 elif [ -b $name ];then 21         echo "$name is a block file."
 22 elif [ -L $name ];then 23         echo "$name is a Link file."
 24 elif [ -d $name ];then 25         echo "$name is a dir file."
 26 else
 27         echo "$name 是其余文件类型"
 28 fi

十二、99乘法表

1 #!/bin/bash 2 # Author: 张琦妮 3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-13 11:46:09
  5 # Name: 99.sh 6 # Version: v1.0
  7 # Description: This is a Script. 8 
  9 for i in `seq 9`;do
 10         for j in `seq 9`;do
 11                 [ $j -le $i ] && echo -n -e "$i*$j=`echo $(($i*$j))`\t"
 12 done 13         echo " "
 14 done

1三、用for循环遍历全部本网络网段中全部的up的电脑

1 #!/bin/bash 2 # Author: 张琦妮 3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-13 11:56:36
  5 # Name: up.sh 6 # Version: v1.0
  7 # Description: This is a Script. 8 
  9 declare -i sum=0
 10 
 11 for i in $(seq 1 100);do
 12         ping -c 1 -w 1 10.6.12.$i &> /dev/null
 13         if [ $? -eq 0 ];then 14                 let sum++
 15                 echo "10.6.12.$i 是通的"
 16         else
 17                 echo "10.6.12.$i 是不通的"
 18 fi 19 done 20 
 21 echo "总共有$sum 台电脑在线"

1四、求出1到100的偶数和

1 #!/bin/bash 2 # Author: 张琦妮 3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-13 12:21:21
  5 # Name: oushuhe.sh 6 # Version: v1.0
  7 # Description: This is a Script. 8 
  9 declare -i sum=0
 10 
 11 for i in $(seq 0 2 100);do
 12         let sum+=$i 13 done 14 
 15 echo "总数为:$sum"

 1五、编写脚本查看CPU,磁盘,内存等信息

1 #!/bin/bash 2 # Author: 张琦妮 3 # Blog: https://home.cnblogs.com/zqntx/
  4 # Time: 2019-09-17 14:57:08
  5 # Name: chakan.sh 6 # Version: v1.0
  7 # Description: This is a Script. 8 cat << EOF 9 菜单 10 -------------------
 11 cpu)显示CPU信息 12 mem)显示内存信息 13 disk)显示磁盘信息 14 quit)退出 15 ------------------
 16 EOF 17 
 18 read -t 5 -p "请输入须要查看的信息:" infomation 19 echo 20 
 21 if [ -z $infomation ];then 22         echo "请输入一个正确的参数"
 23         echo "例如:cpu|mem|disk|quit"
 24         exit 1
 25 fi 26 
 27 if [ $infomation = 'cpu' ];then 28         cat /proc/cpuinfo 29 elif [ $infomation = 'mem' ];then 30         free -m 31 elif [ $infomation = 'disk' ];then 32         fdisk -l 33 elif [ $infomation = 'quit' ];then 34         echo "正确退出"
 35 else
 36         echo "输出内容不正确,请输出以下内容"
 37         echo "例如:cpu|mem|disk|quit"
 38 fi

15.2 编写脚本查看CPU,磁盘,内存等信息。加while循环,执行一个信息不退出。

8 cat << EOF 9 菜单 10 -------------------
 11 cpu)显示CPU信息 12 mem)显示内存信息 13 disk)显示磁盘信息 14 quit)退出 15 ------------------
 16 EOF 17 
 18 while true;do
 19 
 20 read -t 5 -p "请输入须要查看的信息:" infomation 21 echo 22 
 23 if [ -z $infomation ];then 24         echo "请输入一个正确的参数"
 25         echo "例如:cpu|mem|disk|quit"
 26         exit 1
 27 fi 28 
 29 if [ $infomation = 'cpu' ];then 30         cat /proc/cpuinfo 31 elif [ $infomation = 'mem' ];then 32         free -m 33 elif [ $infomation = 'disk' ];then 34         fdisk -l 35 elif [ $infomation = 'quit' ];then 36         echo "正确退出"
 37 else
 38         echo "输出内容不正确,请输出以下内容"
 39         echo "例如:cpu|mem|disk|quit"
 40 fi 41 
 42 done
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