A simple utility to merge ip/ip cidr/ip range, support IPv4/IPv6
$ cidr-merger --help
Usage: cidr-merger [OPTION]... [FILE]...
Write sorted result to standard output.
Options:
--batch batch mode (default if input files supplied or stdin
is not a tty), read file content into memory, then
write to the specified file
--cidr print as ip/cidr (default if not console mode)
-c, --console console mode(default if no input files supplied and
stdin is a tty), all input output files are ignored,
write to stdout immediately
--empty-policy=value indicate how to process empty input file
ignore(default): process as if it is not empty
skip: don't create output file
error: raise an error and exit
-e, --error-if-empty same as --empty-policy=error
-h, --help show this help menu
--ignore-empty same as --empty-policy=ignore
-k, --skip-empty same as --empty-policy=skip
--merge sort and merge input values (default)
--original-order output as the order of input, without merging
-o, --output=file output values to <file>, if multiple output files
specified, the count should be same as input files,
and will be processed respectively
-r, --range print as ip ranges
--simple output as single ip as possible (default)
ie. 192.168.1.2/32 -> 192.168.1.2
192.168.1.2-192.168.1.2 -> 192.168.1.2
-s, --standard don't output as single ip
-v, --version show version info
Sample Usage:
$ echo '1.0.0.1-223.255.255.254' | cidr-merger
> 1.0.0.1
1.0.0.2/31
1.0.0.4/30
1.0.0.8/29
......
1.128.0.0/9
2.0.0.0/7
4.0.0.0/6
8.0.0.0/5
16.0.0.0/4
32.0.0.0/3
64.0.0.0/2
128.0.0.0/2
192.0.0.0/4
208.0.0.0/5
216.0.0.0/6
220.0.0.0/7
222.0.0.0/8
223.0.0.0/9
......
223.255.255.240/29
223.255.255.248/30
223.255.255.252/31
223.255.255.254
$ echo '1.1.1.0' > a; \
echo '1.1.1.1' > b; \
echo '1.1.1.2/31' > c; \
echo '1.1.1.3-1.1.1.7' > d; \
cidr-merger -o merge a b c d; \
cat merge; \
rm a b c d merge
> 1.1.1.0/29
$ wget -O- "https://ftp.apnic.net/stats/apnic/`TZ=UTC date +%Y`/delegated-apnic-`TZ=UTC+24 date +%Y%m%d`.gz" | \
gzip -d | awk -F\| '!/^\s*(#.*)?$/&&/CN\|ipv4/{print $4 "/" 32-log($5)/log(2)}' | \
cidr-merger -eo/etc/chinadns_chnroute.txt # update ip on router
$ # ^ e: means error if input is empty
$ echo 'fe80::/10' | cidr-merger -r
> fe80::-febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
$ echo '1.1.1.0' > a; echo '1.1.1.1' | cidr-merger - a; rm a
$ # ^ -: means standard input
> 1.1.1.0/31Difference between standard and simple(default)
$ echo '1.1.1.1/32' | cidr-merger
> 1.1.1.1
$ echo '1.1.1.1/32' | cidr-merger -s
> 1.1.1.1/32
$ echo '1.1.1.1/32' | cidr-merger -r
> 1.1.1.1
$ echo '1.1.1.1/32' | cidr-merger -rs
> 1.1.1.1-1.1.1.1Difference about empty policy
$ cidr-merger -o txt /dev/null # an empty file named `txt` is created.
$ cidr-merger -ko txt /dev/null # no file is created, and this program exit with code zero
$ # ^ same as `cat /dev/null | cidr-merger --skip-empty --output txt`
$ cidr-merger -eo txt /dev/null # no file is created, and this program exit with code non zero
$ # ^ same as `cat /dev/null | cidr-merger --error-if-empty --output txt`
$ # option `-e` might be useful when download file from internet and then write to a file
$ # There is no difference if you redirect output to a file such as following
$ cat /dev/null | cidr-merger -e > txt
# file `txt` is created, but this program exit with code non zero
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