grep show more lines an the match code example
Example 1: grep show lines above and below
grep -C 3 foo README.txt
Example 2: grep count lines
grep -c ^ filename
Example 3: grep after match
Include -A flag to add lines after match and -B flag to add lines before
grep match -A 3 #display match line and 3 after lines
grep match -B 2 #display match line and 2 lines before