【www.bbyears.com--linux】
[root@LookBack ~]# echo 8.8.8.8|awk -F. "{for(i=1;i<=NF;i++){a="";b=$i;while(b){a=b%2 a;b=int(b/2)}printf("%08d%s",a,i!=NF?".":"\n")}}"
00001000.00001000.00001000.00001000
[root@LookBack ~]#
[root@LookBack ~]#
[root@LookBack ~]# echo 8.8.8.8|awk -F. "{printf "%d\n", ($1*(2^24))+($2*(2^16))+($3*(2^8))+$4}"
134744072
[root@LookBack ~]#
[root@LookBack ~]#
[root@LookBack ~]# echo 00001000.00001000.00001000.00001000|awk -F. "function bin2dec(a,b,i,c){b=length(a);c=0;for(i=1;i<=b;i++){c+=c;if(substr(a,i,1)=="1")c++}return c}{for(j=1;j<=NF;j++)printf("%d%s",bin2dec($j),j!=NF?".":"\n")}"
8.8.8.8
[root@LookBack ~]#
[root@LookBack ~]#
[root@LookBack ~]# echo 1000.1000.1000.1000|awk -F. "function bin2dec(a,b,i,c){b=length(a);c=0;for(i=1;i<=b;i++){c+=c;if(substr(a,i,1)=="1")c++}return c}{for(j=1;j<=NF;j++)printf("%d%s",bin2dec($j),j!=NF?".":"\n")}"
8.8.8.8
[root@LookBack ~]#
#拆分说明
awk -F. "{ #以.做分隔符；
for(i=1;i<=NF;i++){ #把IP分成4段，顺序进入循环；
a=""; #定义一个变量a目前值是空；
b=$i; #定义一个变量b值是进入循环的值；
while(b){ #在awk里面0为假，所以只有b≠0都进入循环体；
a=b%2 a; #假如b=8这里a=0"" 这里""就是上面定义a的作用，当下次进入b=4进入循环体的时候a=00了，再下次b=2进入循环体的时候a=000了；
b=int(b/2) #这里就是在模拟十进制转二进制笔算那一套除以2取结果整数部分；
}
printf("%08d%s",a,i!=NF?".":"\n") #这里其实就是if(i!=NF){printf"%08d",a}else{printf"%08d\n",a}的三目写法，实现打印8位的二进制不足用0补；
}
}"
###下面是网上的awk实现十进制转二进制
##https://www.cs.ucsb.edu/~sherwood/awk/decimal2binary.awk.txt
#!/usr/bin/gawk -f
# ___ _ _ ____ ___ ___ ____ ___ ____
# | \ | | | | | |__| |__] |___
# |__/ |__| |___ | | | | | |___
#
# The scripts were written to be usefull in
# a research enviornment, but anyone is welcome
# to use them. Happy awking. -Tim Sherwood
func get01string(innum,t,retstr,i) {
retstr = "";
t=innum;
while(t){
if (t%2==0) {
retstr = "0" retstr;
}
else{
retstr = "1" retstr;
}
t = int(t/2);
}
return retstr;
}
{
print get01string( $1 );
}