If you’re like most people, using Cntrl+F is the way you live your life.
While Cntrl+F isn’t something you can use through the command line, you can use
find. In general, the command syntax is find [path] expression.
So, to find something with “README” anywhere in the filename from the folder
you’re using the command in, you would use something like:
$ find . -name *README*
There are many other options, all of which are readily Google-able or found through the man page.