I am trying to sort a list of IP addresses into numerical order.
By "numerical order" I mean that each octet is sorted in ascending order and
that all four octets are used as keys from left to right. I also wish to
delete duplicates.
Suppose the list contains the following lines:
192.168.123.5
192.168.21.4
192.168.12.6
192.168.21.4
The desired sort should produce the following result:
192.168.12.6
192.168.21.4
192.168.123.5
Several commands I've tried in an attempt to achieve this result are:
sort -t\. -nuo output-file input-file
sort -t\. -k1 -k2 -k3 -k4 -nuo output-file input-file
sort -t\. -k1n -k2n -k3n -k4n -uo output-file input-file
Each of the above examples produces an incorrect order in which address
192.168.123.5 appears before 192.168.21.4.
I believe the problem occurs because sort is not aligning the assumed
decimal point in each key field even though a numerical (-n) sort is
specified.
Gregg Nelson
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