我的一些简单的shell脚本实例

落日映苍穹つ 2022-08-07 06:34 204阅读 0赞

![Center][]![Center 1][]![Center 2][]

1.模拟linnux登录shell

#/bin/bash
    echo -n "login:" 
    read name
    echo -n "password:"
    read passwd
    if  [ $name = "cht" -a $passwd = "abc" ];then
    echo "the host and password is right!"
    else echo "input is error!"
    fi

2.比较两个数大小

#/bin/bash
    echo "please enter two number"
    read a
    read b
    if test $a -eq $b
    then echo "NO.1 = NO.2"
    elif test $a -gt $b
    then echo "NO.1 > NO.2"
    else echo "NO.1 < NO.2" 
    fi

3.查找/root/目录下是否存在该文件

#/bin/bash
    echo "enter a file name:"
    read a
    if test  -e /root/$a 
    then echo "the file is exist!"
    else echo "the file is not exist!"
    fi

4.for循环的使用

#/bin/bash
    clear
    for num in 1 2 3 4 5 6 7 8 9 10
    do
        echo "$num"
    done

5.命令行输入

#/bin/bash
    echo "Please enter a user:"
    read a
    b=$(whoami)
    if test $a = $b
    then echo "the user is running."
    else echo "the user is not running."
    fi

6.删除当前目录下大小为0的文件

#/bin/bash
    for filename in `ls`  （1前面的 那个字母）
    do
        if test -d $filename
        then b=0
        else    
           a=$(ls -l $filename | awk '{ print $5 }')
                if test $a -eq 0
                 then rm $filename
                 fi
            fi      
    done

7.如果/export/um\_lpp\_source下有文件，那么将其文件系统大小改为3G

#/bin/bash
    while line=`ls /export/um_lpp_source`
    do
            if test $line=""
            then  echo "NULL"
                 sleep 1
        else echo $line
                    chfs -a size=3G /export/um_lpp_source
                     exit 0
            fi
    done

8.测试IP地址

\#/bin/bash  
for i in  1 2 3 4 5 6 7 8 9   
do  
    echo "the number of $i computer is "  
    ping -c 1 192.168.0.$i  
done

9.如果test.log的大小大于0，那么将/opt目录下的\*.tar.gz文件

\#/bin/sh  
a=2  
while name="test.log"  
do  
        sleep 1  
        b=$(ls -l $name | awk '\{print $5\}')  
        if test $b -ge $a  
        \#then echo "OK"  
    then \`cp /opt/\*.tar.gz .\`  
        exit 0  
        fi  
done

10.打印读取的内容，为下面的例子做准备

\#/bin/bash  
while read name  
do  
echo $name  
done

11.从0.sh中读取内容并打印

\#/bin/bash  
while read line  
do  
    echo $line  
done < 0.sh

12.读取a.c中的内容并做加1运算

\#/bin/bash  
test -e a.c  
while read line  
do  
    a=$(($line+1))  
done < a.c  
echo $a

13.普通无参数函数

\#/bin/bash  
p ()  
\{  
    echo "hello"  
\}  
p

14.给函数传递参数

\#/bin/bash  
p\_num ()  
\{  
    num=$1  
    echo $num  
\}  
for n in $@  
do  
    p\_num $n  
done

15.创建文件夹

\#/bin/bash  
while :  
do  
    echo "please input file's name:"  
    read a  
    if test -e /root/$a  
    then  
         echo "the file is existing Please input new file name:"  
    else  
        mkdir $a  
        echo "you aye sussesful!"  
        break   
    fi  
done

16.获取本机IP地址

\#/bin/bash  
ifconfig | grep "inet addr:" | awk '\{ print $2 \}'| sed 's/addr://g'

17.查找最大文件

\#/bin/bash  
a=0  
for  name in \*.\*  
do  
     b=$(ls -l $name | awk '\{print $5\}')  
    if test $b -ge $a  
    then a=$b  
         namemax=$name  
     fi  
done  
echo "the max file is $namemax"

18.查找当前网段内IP用户，重定向到ip.txt文件中

\#/bin/bash  
a=1  
while :  
do  
    a=$(($a+1))  
    if test $a -gt 255  
    then break  
    else  
        echo $(ping -c 1 192.168.0.$a | grep "ttl" | awk '\{print $4\}'| sed 's/://g')  
        ip=$(ping -c 1 192.168.0.$a | grep "ttl" | awk '\{print $4\}'| sed 's/://g')  
        echo $ip >> ip.txt  
    fi  
done

19.打印当前用户

\#/bin/bash  
echo "Current User is :"  
echo $(ps | grep "$$" | awk '\{print $2\}')

20.case语句练习

\#!/bin/bash  
clear  
echo "enter a number from 1 to 5:"  
read num  
case $num in  
    1) echo "you enter 1"  
    ;;  
    2) echo "you enter 2"  
    ;;  
    3) echo "you enter 3"  
    ;;  
    4) echo "you enter 4"  
    ;;  
    5) echo "you enter 5"  
    ;;  
    \*) echo "error"  
    ;;  
esac

21.yes/no返回不同的结构

\#!/bin/bash  
clear  
echo "enter \[y/n\]:"  
read a  
case $a in  
    y|Y|Yes|YES) echo "you enter $a"  
    ;;  
    n|N|NO|no) echo "you enter $a"  
    ;;  
    \*) echo "error"  
    ;;  
esac

22.杀进程

\#/bin/bash  
pid=\`ps -ef | grep '进程相关内容' | grep -v 'grep' | awk '\{ print $2\}'\`  
if \[ -n "$pid" \]; then  
        kill -9 $pid  
fi

23.内置命令的使用

\#/bin/bash  
  
    clear  
        echo "Hello, $USER"  
        echo  
          
        echo "Today 's date id \`date\`"  
  
        echo  
  
        echo "the user is :"  
        who  
        echo  
  
        echo "this is \`uname -s\`"  
        echo  
  
        echo "that's all folks! "

24.

25.

\#/bin/bash

26.打印无密码用户

\#/bin/bash  
echo "No Password User are :"  
echo $(cat /etc/shadow | grep "!!" | awk 'BEGIN \{ FS=":" \}\{print $1\}')

27.

28.检查端口号是否已启动  
\#!/bin/bash  
n=1  
echo "检查xxx服务..."  
while true  
do  
        if test $n -gt 20  
        then   
                echo "xxx服务启动失败"  
                break  
        fi  
                  
        sleep 5  
        n=$(($n+1))  
        port=\`netstat -antp | grep "0.0.0.0:8080"\`  
        if \[ $\{\#port\} -gt 3 \]; then  
                echo "xxx服务已经启动"  
                break;  
        fi

done

29、打印 目录下 所有文件名

#!/bin/bash
    
    for file in *
    do
            echo $file
    done
    VAR=abc
    sleep 3
    exit 0

30、

[Center]: https://img-blog.csdn.net/20150724113509870?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 1]: https://img-blog.csdn.net/20150724113502187?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[Center 2]: /images/20220805/3589734a5a04485d8c77dbfa08ac3b4d.png