xref: /plan9/sys/lib/man/permind/dup2.awk (revision ec59a3ddbfceee0efe34584c2c9981a5e5ff1ec4) 
1$NF!=lastf2 {if(last2!="") print last2
2	 lastf2=lastf1; last2=last1; lastf1=$NF; last1=$0}
3$NF==lastf2 {print}
4END {print last2; print last1}
5