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How to separate data with varying amounts of underscores?

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# 1  
Old 10-31-2014
How to separate data with varying amounts of underscores?

All, I've searched and haven't found a solution for my particular issue.

I have a file with lines of data that contain varying amounts of underscores imbedded. But all the strings have a final underscore and an interface name:


I need to cut each line at the last underscore, keeping the interface name as one variable, and the Fully Qualified Domain name as another. The problem is that the domain has varying amount of periods as well.
Does anyone have a recommendation to get the output I need with awk/cut/ or sed?

appreciate any suggestions!
# 2  
Old 10-31-2014
sed 's/^\(.*\)_\(.*\)/\1 \2/' file

To put the values in variables try this
sed 's/^\(.*\)_\(.*\)/\1 \2/' file | while read fqdn if
echo "fqdn: $fqdn if: $if"

Hope this helps.
This User Gave Thanks to junior-helper For This Post:
# 3  
Old 10-31-2014
Yes! this works, and I can simply awk the side I want for the variable.
Thanks so much for the quick reply
# 4  
Old 10-31-2014
You're welcome Smilie

Btw, here is another approach, handling it with bash's built-ins only, just in case...
while read line
# do something with $fqdn and $if here
done <file

This User Gave Thanks to junior-helper For This Post:
# 5  
Old 10-31-2014
I verified that the bash built in's work as well. I may use this as its easier to understand how it works. Smilie

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