shell练习题

#!/bin/bash
#写一个脚本，给脚本传递两个参数，显示两者之和和两者之积
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]

#!/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

#!/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

#!/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

#!/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

 #!/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

  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

  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

  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 "无法识别"
 23         exit 1
 24 fi

  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