TANGLE(1)						      General Commands Manual							 TANGLE(1)

NAME

       tangle - translate WEB to Pascal

SYNOPSIS

       tangle webfile[.web] [ changefile[.ch] ]

DESCRIPTION

       This manual page is not meant to be exhaustive.	The complete documentation for this version of TeX can be found in the info file or manual
       Web2C: A TeX implementation.

       The tangle program converts a Web source document into a Pascal program that may be compiled in the usual way with the on-line Pascal  com-
       piler  (e.g.,  pc(1)).	The  output  file is all in lower case and packed into lines of 72 characters or less, with the only concession to
       readability being the termination of lines at semicolons when this can be done conveniently.

       The Web language allows you to prepare a single document containing all the information that is needed both to produce a compilable  Pascal
       program	and  to produce a well-formatted document describing the program in as much detail as the writer may desire.  The user of Web must
       be familiar with both TeX and Pascal.  Web also provides a relatively simple, although adequate, macro facility that permits a Pascal  pro-
       gram to be written in small easily-understood modules.

       The  command  line  should have either one or two names on it.  The first is taken as the Web file (and .web is added if there is no exten-
       sion).  If there is another name, it is a change file (and .ch is added if there is no extension).  The change file overrides parts of  the
       Web file, as described in the Web system documentation.

       The  output  files  are a Pascal file and a string pool file, whose names are formed by adding .p and .pool respectively to the root of the
       Web file name.

SEE ALSO

       pc(1), pxp(1) (for formatting tangle output when debugging), tex(1).

       Donald E. Knuth, The Web System of Structured Documentation.

       Donald E. Knuth, Literate Programming, Computer Journal 27, 97-111, 1984.

       Wayne Sewell, Weaving a Program, Van Nostrand Reinhold, 1989, ISBN 0-442-31946-0.

       Donald E. Knuth, TeX: The Program (Volume B of Computers and Typesetting), Addison-Wesley, 1986, ISBN 0-201-13437-3.

       Donald E. Knuth, Metafont: The Program (Volume D of Computers and Typesetting), Addison-Wesley, 1986, ISBN 0-201-13438-1.

       These last two are by far the largest extant examples of Web programs.

       There is an active Internet electronic mail discussion list on the subject of literate programming; send a subscription request to litprog-
       request@shsu.edu to join.

AUTHORS

       Web  was designed by Donald E. Knuth, based on an earlier system called DOC (implemented by Ignacio Zabala).  The tangle and weave programs
       are themselves written in Web. The system was originally ported to Unix at Stanford by Howard Trickey, and at Cornell by Pavel Curtis.

Web2C 7.3.1							 12 February 1993							 TANGLE(1)