OT: help with text file?

[Mike Williams]

>> | Dave Stevens wrote:
>> | > I have a sequence of lines of ASCII text of varying length, each of which ends
>> | > with an integer. Anyone have a quick and dirty way of getting these lines
>> | > copied to a new file with only the last number on each line of the new file?

This tangent would not be complete without a perl version:

perl -ne 'print "$1\n" if /(\d+)$/;'  foot.txt>new_file.txt

Mike