常用的一些shell脚本（一）

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

4000

#/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

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