Analysis of information sources in references of the Wikipedia article "Grep" in English language version.
QGREP.EXE[:] A similar tool to grep in UNIX, this tool can be used to search for a text string
One afternoon I asked Ken Thompson if he could lift the regular expression recognizer out of the editor and make a one-pass program to do it. He said yes. The next morning I found a note in my mail announcing a program named grep. It worked like a charm. When asked what that funny name meant, Ken said it was obvious. It stood for the editor command that it simulated, g/re/p (global regular expression print).
