12 Nov 2007 Sort IP address
Sorting IP addresses using sort is not easy because the dot confuses sort.
This line makes it possible to sort by the whole value of the address
sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 ipaddresses.txt
You can also sort by the last octet
sort -r. -n +3.0 ipaddresses.txt
Posted by Hans-Henry Jakobsen
19 May 2007 Linux routing magic
Suppose you’re setting up a test environment, and you want a server to be able to handle some improbably large number of IP addresses, like a /16 or even larger. You could just write a script to add them all one at a time, or you could use this little shortcut and add the entire netblock at once:
(more…)
Posted by Hans-Henry Jakobsen
