grep 'abc' data.txt | grep 'ghi'
sed -n '/abc/{/ghi/p}' data.txt
awk '/abc/&&/ghi/' data.txt
perl -ne '/abc/&&/ghi/ && print' data.txt
perl -ne 'print if /abc/&&/ghi/' data.txt
perl -ne 'if(/abc/&&/ghi/){print}' data.txt