git: 9front

ref: cb0a62fe37e20ef724530d07d08413b7dde6d7a3
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}