I haven't used Vim in a while and when I started using it again I noticed this
line in $MYVIMRC
:nnoremap <f3> :%!awk '!a[$0]{a[$0]=1;print}'<bar>noh<cr>
I understand that it's mapping to the F3 key, but I can't figure out what the
rest of the line does. Can anyone tell me?
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