One of the most important command line utilities that every Linux user should know is Grep. Grep searches one or more input files for lines containing a match to a specified pattern. By default, Grep outputs the matching lines but it has a ton of flags and options available.

ERRATA:
I mentioned that Grep doesn’t like binaries. That’s not entirely true. There is a way to grep a binary as if it were a text file by using the /”-a/” flag. One thing to note though is many binaries are just one gigantic line so a lot of the time, all you are going to get is the equivalent of a /”cat binary-file/”.

REFERENCED:
► https://www.gnu.org/software/grep/ – GNU Grep

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