git: 9front

ref: b143811a53bf25824e74b7e6e6c2ee7af8c7a954
dir: /sys/lib/man/permind/dup2.awk/

View raw version 
$NF!=lastf2 {if(last2!="") print last2
	 lastf2=lastf1; last2=last1; lastf1=$NF; last1=$0}
$NF==lastf2 {print}
END {print last2; print last1}