How to filter lines from a text file
 

I have some email files that a spam scanner has appended several lines of text to the bottom. I need to remove these footers. Each line to be removed has some unique text I can identify it with, but overall, the lines can be different. This task must be repeated daily. What program could I use to do this without manually editing each file?

I figured if I could search the file for all lines that did *not* contain the strings and pipe it to a file, it would work. I tried using grep, but I could only figure out how to find lines *with* the strings but not without.

Any suggestions are appreciated.

Thanks,
-->Russ

grep -v