I don't grok.
Grep. "The grep command searches one or more input files for lines containing a match to a specified pattern. By default, grep prints the matching lines."
psalter, "A psalter is a volume containing the Book of Psalms,"
fhtagn "ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn A fictional occult phrase from H. P. Lovecraft's The Call of Cthulhu, said to mean "In his house at R'lyeh dead Cthulhu waits dreaming".