abc abb cabby

grep -E "[abc]" test.txt | wc -l

grep 'abcdef' testCount.txt | wc -l

$ echo "abc abb cabby" |
awk '{
    for(i=1;i<=NF;i++)
    if(sub(/a/,"",$i)>0 && sub(/b/,"",$i)>0 && sub(/c/,"",$i)>0) {
        count+=1
    }
}
END{print count}'
2

<file grep -ow 'w+' | grep a | grep b | grep c

abc
cabby