ip2dec, dec2ip, ip2hex and hex2ip

October 19 2014 ,

写程序时经常会因为偷懒在syslog里面直接打10进制或者16进制的ip地址，又或者是数据库中保存的不是ip字符串，当看这些数据时每次都需要手算一些。为了提高效率，写了四个脚本，放到PATH里面就可以执行了。

#!/bin/bash
ip2hex () {
    local a b c d ip=$@
        IFS=. read -r a b c d <<< "$ip"
        printf '0x%x\n' "$((a * 256 ** 3 + b * 256 ** 2 + c * 256 + d))"
}

ip2hex "$@"

#!/bin/bash
hex2ip () {
    local ip dec=$@
    desc=$(($desc))
        for e in {3..0}
    do
        ((octet = dec / (256 ** e) ))
            ((dec -= octet * 256 ** e))
            ip+=$delim$octet
            delim=.
            done
            printf '%s\n' "$ip"
}

hex2ip "$@"

#!/bin/bash
ip2dec () {
    local a b c d ip=$@
        IFS=. read -r a b c d <<< "$ip"
        printf '%d\n' "$((a * 256 ** 3 + b * 256 ** 2 + c * 256 + d))"
}

ip2dec "$@"

#!/bin/bash
dec2ip () {
    local ip dec=$@
        for e in {3..0}
    do
        ((octet = dec / (256 ** e) ))
            ((dec -= octet * 256 ** e))
            ip+=$delim$octet
            delim=.
            done
            printf '%s\n' "$ip"
}

dec2ip "$@"

测试

# ip2hex 1.2.3.4| xargs hex2ip | xargs ip2dec | xargs dec2ip
100.101.102.103

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