这将是输出:
0.0.0.0
0.0.0.1
0.0.0.2
.
.
.
.
255.255.255.253
255.255.255.254
255.255.255.255
也许我需要将其保存到文件中,但是我可以使用>
运算符轻松地做到这一点
echo {0..255}.{0..255}.{0..255}.{0..255} | tr ' ' \\n
但是上面的表达式被bash扩展,由此产生的40亿IP炸毁了外壳。相反,您可以像这样编写嵌套循环:
for octet1 in {0..255}
do
for octet2 in {0..255}
do
for octet3 in {0..255}
do
for octet4 in {0..255}
do
echo $octet1.$octet2.$octet3.$octet4
done
done
done
done
您也可以像这样缩短一点:
for octet12 in {0..255}.{0..255}
do
for octet34 in {0..255}.{0..255}
do
echo $octet12.$octet34
done
done
for ((i=0;i<=255;i++)); do
printf '%d.%d.%d.%d\n' "$i" "$i" "$i" "$i"
done
嵌套循环。 (看起来像反图案针)
for ((i=0;i<=255;i++)); do
for ((j=0;j<=255;j++)); do
for ((k=0;k<=255;k++)); do
for ((y=0;y<=255;y++)); do
printf '%d.%d.%d.%d\n' "$i" "$j" "$k" "$y"
done
done
done
done
ip_range "0.0.0.0" "255.255.255.255" 1
这是一组功能:
#!/usr/bin/env bash
function ip2value() {
local ip=$1 # IP address to convert to decimal
local sum=0
IFS='.' read -ra ADDR <<< "$ip"
for i in "${ADDR[@]}"; do
sum=$(( sum * 256 + i ))
done
echo $sum
}
function value2ip() {
local value=$1
local ip=""
local divisor=$(( 256 ** 3 ))
for x in 0 1 2
do
ip="$ip.$(( value / divisor ))"
value=$(( value % divisor ))
divisor=$(( divisor / 256 ))
done
ip=${ip#.}
ip=$ip.$value
echo $ip
}
# Usage: addIP <ip> [<count>]
# Increase <ip> by <count> ( default 1)
function nextIP() {
local IP=$1
local COUNT=$2
: ${COUNT:=1}
value2ip $(( $COUNT + $( ip2value $1 ) ))
}
function addIPs() {
local IP1=$1
local IP2=$2
value2ip $(( $( ip2value $IP1 ) + $( ip2value $IP2 ) ))
}
function isIP() {
local IP=$1
local VALUE=$( ip2value $IP )
local VIP=$( value2ip $VALUE )
[ "$IP" == "$VIP" ]
}
function ip_range() {
local FIRST=$1
local LAST=$2
local STEP=$3
: ${STEP:=1}
local ip=$(ip2value $FIRST)
local last=$(ip2value $LAST)
while
[ $ip -le $last ]
do
echo $( value2ip $ip )
ip=$(( ip + 1 ))
done
}