常用的一些shall脚本（二）

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.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! "

23.打印无密码用户

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

24.

#/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! "

25.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

                                      -------转自http://www.jb51.net/article/54488.htm