shell脚本练习（三）

客官°小女子只卖身不卖艺 2022-09-23 14:48 201阅读 0赞

**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`
    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.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