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troff (/ ˈ t iː r ɒ f /), short for "typesetter roff", is the major component of a document processing system developed by Bell Labs for the Unix operating system. troff and the related nroff were both developed from the original roff.
groff (/ ˈ dʒ iː r ɒ f / JEE-roff) [5] (also called GNU troff) is a typesetting system that creates formatted output when given plain text mixed with formatting commands. [6] It is the GNU replacement for the troff and nroff text formatters, which were both developed from the original roff.
nroff was written by Joe Ossanna for Version 2 Unix, [1] in Assembly language and then ported to C.. It was a descendant of the RUNOFF program from CTSS, the first computerized text-formatting program, and is a predecessor of the Unix troff document processing system.
c. 50 – Aulus Cornelius Celsus died, leaving De Medicina, a medical encyclopedia; Book 3 covers mental diseases.The term insania, insanity, was first used by him. The methods of treatment included bleeding, frightening the patient, emetics, enemas, total darkness, and decoctions of poppy or henbane, and pleasant ones such as music therapy, travel, sport, reading aloud, and massage.
roff is a typesetting markup language.As the first Unix text-formatting computer program, it is a predecessor of the nroff and troff document processing systems. [1]: 290 ...
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A refer bibliographic database is a text file consisting of a series of records, separated by one or more blank lines. Within each record, each field starts with a %-sign at the beginning of the line and one character immediately after. The name of the field should be followed by exactly one space, and then by the contents of the field.
Sharable Content Object Reference Model (SCORM) is a collection of standards and specifications for web-based electronic educational technology (also called e-learning). It defines communications between client side content and a host system (called "the run-time environment"), which is commonly supported by a learning management system.