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

sort < bar > foo
uniq  < foo > bar

bar now has no duplicated lines