... book¹

A good starting point is The Unix Programming Environment by Brian W. Kernighan and Rob Pike. Prentice Hall, Inc., 1984 or Linux in a Nutshell, 4th Edition A Desktop Quick Reference By Ellen Siever, Stephen Figgins, Aaron Weber, 4th Edition June 2003

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... grep²

The original UNIX text editor ``ed'' has a construct g/re/p, where ``re" stands for a regular expression, to Globally search for matches to the Regular Expression and Print the lines containing them. This was so often used that it was packaged up into its own command, thus named ``grep''. According to Dennis Ritchie, this is the true origin of the command.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.