how to grep lines before a pattern code example

Example 1: how to grep lines before a pattern

cat abc.txt | grep -A 3 "your_pattern"  # will grep 3 lines after your pattern..

Example 2: 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