1.模拟linnux登录shell
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#/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
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#/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 $b then echo "NO.1 > NO.2" else echo "NO.1 < NO.2" fi |
3.查找/root/目录下是否存在该文件
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#/bin/bash echo "enter a file name:" read a if test -e /root/$a then echo "the file is exist!" else echo "the file is not exist!" fi |
4.for循环的使用
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#/bin/bash clear for num in 1 2 3 4 5 6 7 8 9 10 do echo "$num" done |
5.命令行输入
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#/bin/bash echo "Please enter a user:" read a b=$(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
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#/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
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#/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
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#/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
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#/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
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#/bin/bash while read name do echo $name done |
11.从0.sh中读取内容并打印
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#/bin/bash while read line do echo $line done < 0 .sh |
12.读取a.c中的内容并做加1运算
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#/bin/bash test -e a.c while read line do a=$(($line+ 1 )) done < a.c echo $a |
13.普通无参数函数
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#/bin/bash p () { echo "hello" } p |
14.给函数传递参数
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#/bin/bash p_num () { num=$ 1 echo $num } for n in $@ do p_num $n done |
15.创建文件夹
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#/bin/bash while : do echo "please input file's name:" read a if test -e /root/$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
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#/bin/bash ifconfig | grep "inet addr:" | awk '{ print $2 }' | sed 's/addr://g' |
17.查找最大文件
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#/bin/bash a= 0 for name in *.* do b=$(ls -l $name | awk '{print $5}' ) if test $b -ge $a then a=$b namemax=$name fi done echo "the max file is $namemax" |
18.查找当前网段内IP用户,重定向到ip.txt文件中
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#/bin/bash a= 1 while : do a=$(($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
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#/bin/bash echo "Current User is :" echo $(ps | grep "$$" | awk '{print $2}' ) |
20.case语句练习
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#!/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
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#!/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
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#/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
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#/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
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#/bin/bash echo "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
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#!/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 |
原文链接:http://blog.163.com/hbu_lijian/blog/static/1261291532011113035622113/