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#!/usr/bin/sed -f h
:b # On the last line, print and exit $b N /^\(.*\)\n\1$/ { # The two lines are identical. Undo the effect of # the n command. g bb }
# If the N
command had added the last line, print and exit
$b
# The lines are different; print the first and go # back working on the second. P D
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