Novice from Competent:

Which command will find all the lines in a file containing the word "cheese"?

1. grep "cheese" file
2. list "cheese" file
3. locate "cheese" file
4. find "cheese" file

Competent from Expert:

Which command will extract all and only the words containing the letters "db" from a file?

1. cat file

   grep -w db

   sort -u

2. grep db file

   tr " " "n"

   sort -u

3. tac file

   grep -i db

   sort

   uniq

4. grep -o -E 'w+' file

   uniq