简单实用的shell小脚本

转自网络

1.模拟linnux登录shell

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

2.比较两个数大小

#/bin/bashecho "please enter two number"read aread bif test $a -eq $bthen echo "NO.1 = NO.2"elif test $a -gt $bthen 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/bashecho "enter a file name:"read aif 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/bashclearfor num in 1 2 3 4 5 6 7 8 9 10do    echo "$num"done

5.命令行输入

#/bin/bashecho "Please enter a user:"read ab=$(whoami)if test $a = $bthen 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/bashfor 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/bashwhile 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        fidone

8.测试IP地址

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

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

 #/bin/sha=2while 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        fidone

10.打印读取的内容，为下面的例子做准备

#/bin/bashwhile read namedoecho $namedone

11.从0.sh中读取内容并打印

#/bin/bashwhile read linedo    echo $linedone < 0.sh

12.读取a.c中的内容并做加1运算

#/bin/bashtest -e a.cwhile read linedo    a=$(($line+1))done < a.cecho $a

13.普通无参数函数

#/bin/bashp (){    echo "hello"}p

14.给函数传递参数

#/bin/bashp_num (){    num=$1    echo $num}for n in $@do    p_num $ndone

15.创建文件夹

#/bin/bashwhile :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     fidone

16.获取本机IP地址

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

17.查找最大文件

#/bin/basha=0for  name in *.*do     b=$(ls -l $name | awk '{print $5}')    if test $b -ge $a    then a=$b         namemax=$name     fidoneecho "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/basha=1while :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    fidone

19.打印当前用户

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

20.case语句练习

#!/bin/bashclearecho "enter a number from 1 to 5:"read numcase $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/bashclearecho "enter [y/n]:"read acase $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/bashpid=`ps -ef | grep '进程相关内容' | grep -v 'grep' | awk '{ print $2}'`if [ -n "$pid" ]; then        kill -9 $pidfi

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

25.检查端口号是否已启动

#!/bin/bashn=1echo "检查xxx服务..."while truedo        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;        fidone