IP的字符串和整型格式转换

时间：2009-04-30 来源：tessykandy

#!/bin/sh

usage="Usage `basename $0` [option] [values]\n
-s: 167772161     => 10.0.0.1\n
-l: 10.0.0.1     => 167772161\n
-h or -? : for help\n\n
For example: convert 10.0.0.1 to 167772161,input:\n
     ./`basename $0` -l 10.0.0.1\n"

LongToStr(){
    a=`echo $1|cut -d\. -f1`
    b=`echo $1|cut -d\. -f2`
    c=`echo $1|cut -d\. -f3`
    d=`echo $1|cut -d\. -f4`

    itip=`expr $a \* 256 \* 256 \* 256 + $b \* 256 \* 256 + $c \* 256 + $d `
    echo $1 "======>" $itip
}

StrToLong() {
    itip=$1
    a=$(($itip/256/256/256))
    b=$(($itip/256/256-$a*256))
    c=$(($itip/256-$a*256*256-$b*256));
    d=$(($itip-a*256*256*256-$b*256*256-$c*256))

    echo $1 "=======>" $a"."$b"."$c"."$d
}

if [ $# != 2 ];then
    echo -e $usage
    exit
fi

if [ "$1" == "-l" ];then
    LongToStr $2
elif [ "$1" == "-s" ];then
    StrToLong $2
else
    echo -e $usage
    exit 1
fi

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