Install ack by entering the following commands in the terminal:
sudo apt update sudo apt install ack
grep-like program specifically for large source trees
Ack is designed as an alternative for 99% of the uses of grep. ack is intelligent about the files it searches. It knows about certain file types, based on both the extension on the file and, in some cases, the contents of the file. . Ack ignores backup files and files under CVS and .svn directories. It also highlights matches to help you see where the match was. Ack uses perl regular expressions.