egrep

This will search for patterns in multiple files.

Example:
egrep -wc turkey mytext
3
This returns the information that the whole word turkey is found 3 times in the file mytext.

Options
-c number of matches
-C display two lines before and after each match
-e pattern search for pattern
-f file uses a pattern from a file
-i ignore case
-l lists files that contain matches
-L lists files that have no matches
-w lists whole words that are matched