uniq

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FreeBSD/Linux

Remove duplicates - one word per line

# echo -e converts \n to newline

echo -e "Anna\nAnna\nAnna\nDavid\nDavid" | uniq
Anna
David

echo -e "Anna\nAnna\nAnna\nDavid\nDavid" | uniq -c
   3 Anna
   2 David