Asked to tell what the following command does

[dav2fun]

:7,11s/\^\[0-9\]/Toughie/c

[RedSon]

Command not found.

[jkmyoung]

I'm guessing you're defining a label, but this will probably only work in a batch script. Also the behaviour will differ depending on the system you're running on.

[ennoil]

In vi, at least, this will replace a number that is the first character on a line (lines 7-11 only) with the string "Toughie". The 'c' at the end will ask the user for confirmation.