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Issue description

Step 7 of this GE uses the `whereis` command which is not introduced in the lecture.
Students asked in class about this command and were a bit confused about the usefulness of this tool.
I would suggest dropping this step altogether.
One useful tool to mention would be the whatis command. This is the equivalent of `man -f`. It provides very nice one-line summaries of commands:

student@workstation:~$ whatis cut
cut (1)              - remove sections from each line of files
student@workstation:~$ whatis grep
grep (1)             - print lines that match patterns
student@workstation:~$ whatis wc
wc (1)               - print newline, word, and byte counts for each file

We do talk about `apropos` searches so why skip `whatis`? Both are native `man` command "flavors".

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