#!/bin/bash

read -p "input a dight:"

echo $REPLY

DATE=`date`

echo "DATE is ${DATE}"

USERS=`who |wc -l`

echo "LOGIN in user is ${USERS}"

UP=`date;uptime`

echo "Uptime is ${UP}"

#echo "HELLO World!"

#echo "what is your name"

#read person

#echo "HELLO ${person}"

#name="huangtao"

#echo ${name}

myUrl="http://www.baidu.com/"

#readonly myUrl

#myUrl="http://www.sina.com.cn/"

#myUrl

#unset myUrl

#echo ${myUrl}

echo "file name:$0"

echo "1st parameters:$1"

echo "2nd parameters:$2"

echo "values:$*"

echo "values:$@"

echo "pid:$$"

echo "return value:$?"

echo "Total number paramters:$#"

a=10

echo -e "value a is ${a}\n"

echo "value a is ${a}\n"

d=`date +%F`

exec >$d.log 2>&1

echo "Begin at `date`"

ls /learing

cd /log

ls /root >root.log

echo "End at `date`"

ipaddress()

{

ifconfig |grep -A1 "$1"|tail -1|awk '{print $2}'|awk -F ':' '{print $2}'

}

read -p "请输入网卡名字：" ipname

myip=`ipaddress $ipname`

echo "$ipname address is $myip"

#机器台数

machineNum=`ifconfig |grep -n '^[a-zA-Z0-9]'|wc -l`

#获取机器的机器名所在行和机器名

machineName=`ifconfig |grep -n 'Link encap'|awk -F' ' '{print $1}'|awk -F':' '{print $2}'`

#获取机器的机器名对应的IP地址

machineIP=`ifconfig |grep -n 'inet addr'|awk -F':' '{print $3}'|awk -F' ' '{print $1}'`

for num in `seq 1 $machineNum`;

do

#`echo "$machineName"|sed -n '$num' p"`

n=`echo "$machineName"|sed -n "$num"p`

m=`echo "$machineIP"|sed -n "$num"p`

echo "机器$num:$n的IP地址是:$m";

done

#if例子1

a=1

if [ $a == 2 ]

then

echo "true"

elif [ $a -lt 10 ]

then

echo "no false"

else

echo "false"

fi

#if例子2

# > gt < lt

# >= ge <= le == eq != ne

read -p "please input a digit:" n

#n2=`echo $n|grep -c '[^0-9]'`

#n1=$[$n%2]

#if [ $n2 -eq 1 ]

if echo $n | grep -q '[^0-9]'

then

echo "你输入的不是数字，请重新输入"

exit 1

fi

n1=$[$n%2]

#if例子3

if [ $n1 -eq 0 ]

#if(($n1==0))

then

echo "输入的是偶数"

else

echo "输入的是基数"

fi

#for循环例子1

#while read line

for i in `cat ip.txt`

do

echo -e "\033[32m scp -r /root/learing/t8.sh root@$i:/tmp \033[0m"

done

#for循环例子2

pfile=`find . -name "*.sh"|tail -2`

for i in `$pfile`

do

tar -czvf 2016-07-22.tar.gz $i

done

#for循环例子3

j=0

for((i=1;i<=100;i++))

do

j=`expr $i + $j`

done

echo $j

#for循环例子4

for ip in `cat ip.txt`

do

echo $ip

./rsync.expect $ip ip.txt

done

#for循环例子5

sum=0

for i in `seq 1 100`

do

sum=$[$sum+$i]

echo $i

done;

echo $sum

#for循环例子6

for f in `ls /etc/`

do

if [ -d /etc/$f ]

then

ls -d /etc/$f

#echo "/etc/$f"

fi

done;

#for循环例子7

n=`wc -l passwd |awk '{print $1}'`

for i in `seq 1 $n`;

do

sed -n "$i"p passwd;

done

#if while循环例子

FILES=$*

if [ -z $* ];

then

echo -e "\033[32m{usage:$0 /boot|/tmp|/tmp/test.txt}\033[0m"

exit

fi

for i in `echo 192.168.204.129 127.0.0.1`

do

scp -r $FILES root@$i:/root/install

done

#while循环例子1

i=0

#while [ $i -lt 5 ]

while [[ $i<5 ]]

do

echo "$i"

((i++))

done

#while循环例子2

while :

do

read -p "请输入:" n

if [ -z $n ]

then

echo "需要输入内容:"

continue

fi

n1=`echo $n|sed 's/[0-9]//g'`

if [ ! -z $n1 ]

then

echo "需要输入数字:"

continue

fi

break

done

echo $n

#while循环例子3

while :

do

load=`w|head -1|awk -F 'load average: ' '{print $2}'|cut -d'.' -f1`

if [ $load -gt 10 ]

then

top|mail -s "load is high:$load" load@163.com

fi

sleep 30

done

#while循环例子4

while read line

do

echo -e "\033[32m scp -r /root/learing/t8.sh root@$line:/tmp \033[0m"

done < ip.txt

#while循环例子5

while read line

do

echo $line

done </etc/hosts

#if case 循环例子1

read -p "Please input a Number:" n

n1=`echo $n|sed 's/[0-9]//g'`

if [ ! -z $n1 ]

then

echo "Please input a Number."

exit 1

elif [ $n -lt 0 ] || [ $n -gt 100 ]

then

echo "The number ranger is 0-100"

exit 1

fi

n2=$[$n%2]

case $n2 in

0)

echo "偶数"

;;

1)

echo "奇数"

;;

*)

echo "Please input a Number."

;;

esac