Is there a "revese" flag in unix tail command?

hello all,
iv'e been given a homework assignment in which i should
among other things print a part of a text file backwards from the end using the unix command TAIL with some reverse flag

i searched in the man page and did not find such flag,
then googled it and found the following :

tail [+ number] [-l] [-b] [-c] [-r] [-f] [-c number | -n number] [file]

where -r is the reverse flag
but when i run "tail -r myfile.txt"
in the termial i get "tail: invalid option -- 'r' "

so is it becouse my unix is too old or somthing?
or what is going on with that ?

thanks,

and im using xubuntu 10.10 on virtual machine if it matters

You can pipe the output of 'tail' to the 'rev' utility.

thanks for the reply but the rev utility reverse the order of characters in every line, i need to reverse the order of the lines

something like: "tail -r -2 myfile.txt"

that will print to terminal:

"last line of file..."
"second to last line of file..."

Sorry, I misread the manpage - try "tac" instead.