Eliminate partially duplicate lines by column and keep the last one

Question

I have a file that looks like this:

2011-03-21 name001 line1
2011-03-21 name002 line2
2011-03-21 name003 line3
2011-03-22 name002 line4
2011-03-22 name001 li         


        

Answer 1

EDIT: Here's a version that actually answers the question.

sort -k 2 filename | while read f1 f2 f3; do if [ ! "$f2" = "$lf2" ]; then echo "$f1 $f2 $f3"; lf2="$f2"; fi; done