The wonder of !$ and !*
!$
Ever wanted to re-use the last argument you gave to a command?
<some command> !$
This tells the command to use the last argument given in the previous command.
<some command> !*
This will tell the current command to use all of the previous command's parameters instead of just the last one.
touch file 200 202 chmod 777 !$ chmod 777 202 touch file 100 10 chmod 777 !* chmod 777 file 100 102