SHELL简单脚本编写

Posted 2020-10-18

vim /root/7.sh

#!/bin/bash

X=$[RANDOM%10+1]

read -p "[1-10]你猜：" cai

if [ $cai -eq $X ];then

  echo 恭喜你猜对了

  exit

elif [ $num -gt $X ];then

  echo 猜大了

else

  echo 太小了

fi

vim /root/6.sh

#!/bin/bash

read -p "请输入一个软件包：" b

b=$(rpm -qa | grep "$a")

if [[ -z $b ]];then

  echo "没有安装"

else

  echo "已经安装"

fi

vim /root/5.sh

#!/bin/bash

netstat -anptu | grep httpd &> /dev/null

if [ $? -eq 0 ];then

  echo "已经启动"

else

  echo "没有启动"

fi

vim /root/4.sh

#!/bin/bash

ping -c3 -i0.2 -w1 $1 &> /dev/null

if [ $? -eq 0 ];then

  echo "host $1 up"

else

  echo "host $1 down"

fi

vim /root/3.sh

#!/bin/bash

[ -d /mnt ] || mkdir /mnt

mount /dev/cdrom /mnt

vim /root/2.sh

#!/bin/bash

[ ! -d /mnt ] && mkdir /mnt

mount /dev/cdrom /mnt

vim /root/1.sh

#!/bin/bash

num=$(who | wc -l)

[ $num -gt 10 ] && mail -s errot root < mail.txt

crontab -e 

 *  *  *  *  * /root/1.sh

vim /mail.txt

     

隔壁老王来了

ping 176.130.8.50-150,开启的有多少个，没有开启的有多少个

#!/bin/bash

x=0

y=0

for i in {100..150}

do

  ping -c2 -i0.1 -W1 176.130.8.$i &> /dev/null

  if [ $? -eq 0 ];then

    echo "176.130.8.$i is up"

    let x++

  else

    echo "176.130.8.$i is down"

    let y++

  fi

done

echo  "开机的有$x个, 关机的有$y个"

求1+2+3+4+5......100的和

#!/bin/bash

sum=0

for i in {1..100}

do

  let sum+=i

done

echo "总和$sum"

求1*2*3*4......30的积

#!/bin/bash

sum=1

for i in {1..50}

do

  let sum\*=i

done

echo "总共是 $sum" 

将/var/log每个文件，单独打包，保存到/tmp中

for i in `ls /var/log`

do

  tar -czf /tmp/$i.tar.gz /var/log/$i

done

----------辅助理解/var/log/文件理解的打包过程

for i in a.txt b.txt c.txt d.txt

do 

   i=a.txt

   tar -czf /tmp/$i.tar.gz /var/log/$i

done

利用Shell脚本，猜一个随机数

#!/bin/bash

y=0

num=$[RANDOM%100+1]

while :

do

read -p "[1-100] , 你猜一个数:" cai

let y++

  if [ $cai -eq $num ];then

    echo "恭喜猜对了, 你猜了$y次"

    exit

  elif [ $cai -gt $num ];then

    echo "猜大了"

  else

    echo "猜小了"

 fi

done

case语句

如果参数是redhat,则显示是fedora

如过参数是fedora，则显示是redhat

如果参数是其他，则显示是Useage

#!/bin/bash

case "$1" in

redhat)

  echo "fedora";;

fedora)

  echo "redhat";;

*)

  echo "Usage";;

esac

case语句（判断语句），简化if语句-----------只能进行两个值之间是否相等

#!/bin/bash

case "$1" in

-n)

  touch $2;;

-e)

  vim $2;;

-c)

  cat $2;;

-r)

  rm -rf $2;;

*)

  echo "Usage:$0 (-n|-e|-c|-r|)" 文件名

esac

Shell调用函数----------就是给一段命令取个别名（函数）

基本格式：函数名 (){

大括号中间跟命令

}

调用函数：函数名 

ll（ls -l）

#!/bin/bash

cecho (){

  echo -e "\033[$1m$2\033[0m"

}

cecho  32 OK

cecho  34 Error

cecho  35 Waring

3X：是字体颜色

4X：是背景颜色

X：表示样式

While语句

固定格式：while 

i=1

while [ $i -lt 10 ]

do

  echo "你好"

  let i++

done

break,contine,exit给脚本的间接中断在重复使用

(1)break中断整个循环体

(2)continue中断本次循环，立即跳入下一次循环

(3)exit中断整个脚本

#!/bin/bash

for i in {1..5}

do

  [ $i -eq 3 ] && break

  echo $i

done

echo OK

#!/bin/bash

for i in {1..5}

do

  [ $i -eq 3 ] && continue

  echo $i

done

echo OK

#!/bin/bash

for i in {1..5}

do

  [ $i -eq 3 ] && exit

  echo $i

done

echo OK

#!/bin/bash

sum=0

while :

do

  read -p "请输入数字[0结束]:" xx

  [ $xx -eq 0 ] && break

  let  sum+=xx

done

echo "总和是$sum"

打印9*9乘法表

#!/bin/bash

for i in `seq 9`

do

  for x in `seq $i`

  do

    echo -n "$i*$x=$[$i*$x]"

  done

echo

done

猴子摘香蕉

#!/bin/bash

x=1

for i in {1..8}

do

  let x=x+1

  let x=x*2

done

echo $x

国际象棋

#!/bin/bash

b=1

while [ $b -le 4 ]

do

  for i in {1..4}

  do

    echo -en "\033[40m  \033[0m"

    echo -en "\033[47m  \033[0m"

  done

  echo

  for i in {1..4}

  do

    echo -en "\033[47m  \033[0m"

    echo -en "\033[40m  \033[0m"

    done

    echo

  if [ $b -eq 2 ];then

    echo -e "\033[47m  楚河汉界   \033[0m"

  fi

  let b++

done

#!/bin/bash

read -p "请输入用户名:" name

read -p "请输入用户密码:" pass

if [ -z "$name" ];then

  echo "必须输入用户名"

  exit

fi

pass=${pass:-123456}

useradd $name

echo "$pass" | passwd --stdin $name

提示用户输入一个数：如果输入的是10，则脚本1+2+3+4.....10

如果输入的是20，则脚本1+2+3....+20

如过没有输入，则脚本1+2+3+4......+100

#!/bin/bash

read -p "请输入一个数字:" xx

xx=${xx:-100}

sum=0

for i in `seq $xx`

do

  let sum+=i

done

echo "总和是$sum"

创建文件touch {a,b,c,d}.txt，把 .txt后缀改为 .doc

#!/bin/bash

for i in `ls *.txt`

do

  mv $i ${i%.txt}.txt

done

改变参数，赋予变量

#!/bin/bash

for i in `ls *.$1`

do

  mv $i ${i%.$1}.$2

done

#!/bin/bash

sum=0

for i in `seq 2 2 100`

do

  let sum=sum+i

done

echo "$sum"

sum=0

for i in `seq 1 2 99`

do

  let sum+=i

done

echo "总和是$sum"

#tmp=0

read -p "shu zi" num

num=${num:-100}

for i in `seq 2 2 $num`

do

  let tmp+=i

done

echo $tmp

 #!/bin/bash

case $1 in

start)

      if [ -f /usr/local/nginx/logs/nginx.pid ];then

         echo "正在运行"

      else

         /usr/local/nginx/sbin/nginx

         echo "启动成功"

     fi;;

stop)

     if [ ! -f /usr/local/nginx/logs/nginx.pid ];then

        echo "已经关闭"

     else

        /usr/local/nginx/sbin/nginx -s stop

        echo "关闭成功"

     fi;;

restart)

     if [ -f /usr/local/nginx/logs/nginx.pid ];then

         /usr/local/nginx/sbin/nginx -s stop

         /usr/local/nginx/sbin/nginx

        echo "重启成功"

     else

        /usr/local/nginx/sbin/nginx

        echo "重启成功"

    fi;;

status)

    if [ -f /usr/local/nginx/logs/nginx.pid ];then

       netstat -ntulp |grep nginx

    else

       echo "没有运行"

    fi;;

*)

       echo "Error";;

esac