grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. It was originally developed for the Unix operating system, but later available for all Unix-like systems including Linux. I use grep very much on Linux.
In this video Brian Kernighan discusses the origin of grep command
If you are new to grep, see this grep/egrep tutorial https://www.cyberciti.biz/faq/howto-use-grep-command-in-linux-unix/
#Unix #Linux #Sysadmin