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 $bthen echo "NO.1 > NO.2"else echo "NO.1 < NO.2"fi
3.查找/root/目录下是否存在该文件
#/bin/bashecho "enter a file name:"read aif test -e /root/$athen 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 9do 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 原文链接：http://blog.163.com/hbu_lijian/blog/static/1261291532011113035622113/