In the recorded lecture material of week-8, I introduced regular expressions, and 3
frequently used commands that use them - grep, sed, and awk.
The use of the first two commands was (hopefully) clear, but in the last 5 minutes of the
video I made a mistake in my awk example, just wasting everyone's time!
So, this week there are 2 video recordings, one about 70 minutes long covering regular
expressions and their uses, and a second 10-minute sequel replacing the last 5-minutes of
the first video (if only my skills were in video editing....)
Sorry for the confusion with these recordings!