The original Unix text editor, ed, (also created by Thompson) wasn't capable of searching such a large body of text given the hardware limitations of the time. But since these articles were anonymous, the scientist was trying to identify the authors based on linguistic pattern. This extensive body of work was a collection of 85 anonymous articles and essays drafted in defense of the United States Constitution. This scientist's goal was to examine linguistic patterns to identify the authors (including Alexander Hamilton) of the Federalist Papers. Thompson built grep to assist one of his colleagues at Bell Labs. He helped create Unix, popularized its modular approach, and wrote many of its programs including grep. Ken Thompson has made some incredible contributions to computer science. The interesting story behind creation of grep This is the official narrative, but you may also see it described as Global Regular Expression ( Processor | Parser | Printer). It is much faster at searching large files. It performs a global research for a regular expression and prints it. The grep command does what the g/re/p commands did in the editor. In which, the input g/re/p performed a global (g) search for a regular expression (re), and subsequently printed (p) any matching lines. This is at least partially true, but it depends on who you ask.Īccording to reputable sources, the name is actually derived from a command in a UNIX text editor called ed. With its unusual name, you may have guessed that grep is an acronym. It is used for finding a search patterns in the content of a given file. Grep is a command line utility in Unix and Linux systems. In this explainer article, I'll tell you what is grep command and how does it work. 163-164).If you use Linux for regular work or developing and deploying software, you must have come across the grep command. (Be sure you get version 1.1, since version 1.0 bombs on MacWrite 2.2 documents.) You might ask more from a commercial product, but Grep-Wc is extremely useful, reasonably small at 12K-and free. It uses no scroll bars but starts at the beginning and runs the document sequentially through its screen window. Grep-Wc is limited to reading only those files, ignoring MacWrite formatting information and pictures. However, for most people the real value of Grep-Wc is its ability to read MacWrite and text files from within applications. The acronym Grep (Globally search for Regular Expressions and Print) means the ability to show on the screen every line in a document containing a string of characters-even to look for those characters at only certain places in each line. The word-count feature is also a handy supplement to MacWrite. That may not be elegant, but it's adequate if your cut-and-paste needs are modest, or if you only need to read another document. Although Grep-We won't let you edit the document, it will save it as a text file, which you can then open with a text-file DA and copy via the Clipboard into MacWrite. It can open a second window in MacWrite, too. Hiding under the cryptic name of Grep-Wc is a handy DA that reads and counts words in text and MacWrite files, You can use it to read on-disk documents from any application that supports DAs. Set a pattern to match (simple regex grep) inside text files, and/or perform a word count
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