我的一些简单的shell脚本实例

安哥网络

自己写了一下小的shell实例，虽然很小，但所有的大的程序都是由小的模块堆积起来的，程序员一定要懂得一种脚本的书写，而我，只会在linux下工作，所以就只能写linux的shell脚本了，呵呵，本文会陆续更新，给自己加油！
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 "$num"
done
5.
#/bin/bash
echo "Please enter a user:"
read a
b=$(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.


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.
#/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! "

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
摘自：http://blog.163.com/hbu_lijian/b ... 532011113035622113/