Script to unorder an ordered list

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# 1  
Old 08-14-2008
Script to unorder an ordered list

Wondering if someone could help me with this in any scripting/programming language. I have a list of ordered IP addresses and I want to unorder them. So for example, if I had a file like this:

I would want to make it so that is unordered. It does not matter the outcome as long as they are not in ascending/descending order. So something like the following would be acceptable:

I would need to do this on very large lists of IP addresses such as 500. Any help would be very much appreciated.
# 2  
Old 08-14-2008
The semi-obvious Google search seems to bring up promising hits.
# 3  
Old 08-14-2008
Instead of the "unorder.txt" replay your filename and try the below.

perl -wne 'printf "%f,%s", rand 1**2, $_' <unorder.txt |sort|cut -d"," -f2
# 4  
Old 08-14-2008
Just to make the solution more general, you need -f2- in case the input contains commas.
# 5  
Old 08-14-2008
First check whether your shell has $RANDOM.
(Should give two different numbers)
We can then number the lines randomly, then sort them.

cat list_of_ip_addresses | while read IP
echo "${RANDOM} ${IP}"
) | sort -n | awk '{print $2}'
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