Add two more options to "less" command

[DelilahYM]

In https://librarycarpentry.org/lc-shell/03-working-with-files-and-folders/index.html, when we mentioned "less" command in "Reading files" session, I found it would be very useful to introduce the following two items with "less":

1. (Display line numbers)The "-N" option with less to display the file with line numbers, which is extremely useful when looking at log/error files, and
2. (Pattern search) "$ less -pPATTERN filename", OR, once inside less, use "/" followed by your pattern to do interactive searching (forwards). "n" and "N" repeat the search in the forward and reverse direction, respectively.

[jmjamison]

Question. If this is an introduction to the shell I'm not sure if isn't throwing too much at the participants. I have to go back through the lesson and see if wildcards had been introduced yet. Other opinions?