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bash grep for two terms in same line

# Basic syntax:
grep first_word input_file | grep second_word
# Where:
#	- this finds all lines that contain the first_word and then pipes them
# 	  to a second filter that looks for the second_word, resulting in all
# 	  lines that contain both words. Simply add more pipes and greps to 
# 	  return lines that meet other search criteria. 

how to grep two terms at once grep

grep -e "BBB" -e "AAA" file.txt