1 h 2 3 :b 4 # On the last line, print and exit 5 $b 6 N 7 /^\(.*\)\n\1$/ { 8 # The two lines are identical. Undo the effect of 9 # the n command. 10 g 11 bb 12 } 13 14 # If the @code{N} command had added the last line, print and exit 15 $b 16 17 # The lines are different; print the first and go 18 # back working on the second. 19 P 20 D 21
