UNIX for Dummies Questions & Answers

I have been trying to find files containing the words AAA, BBB and CCC.
I tried:

grep AAA `grep BBB files*` grep CCC files*
but is does not work
I tried several ways

this is an easy one but I am a dummy, Does anyone can help me?
Thanks

Code:

grep -l CCC $(grep -l BBB $(grep -l AAA files*))

This will work as follows: the innermost grep will search for files that have "AAA" and print the filenames. The filenames printed are used by the second grep to search for string "BBB". This grep will also print the filenames. Now the filenames printed by the second grep contain both "AAA" and "BBB". Then the last(outermost) grep will search for "CCC" in the filenames printed by the second grep. The filenames that are printed by the outermost grep contain all three patterns.

or fgrep -e 'AAA' -e 'BBB' -e 'CCC' file_name

This will return files that contain any of the patterns, not all. The OP wants to get files that have all the three patterns (I think).

wondering whether will not suffice?
grep AAA file* | grep BBB | grep CCC

Thanks blowtorch, this one worked fine!!!

Code:

grep -E "aa|bb|cc" filename
grep -e "aa" -e "bb" -e "cc" filename
or
egrep -E "aa|bb|cc" filename