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NAME
     tangle - translate WEB to Pascal

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

DESCRIPTION
     This manual page is not meant to be  exhaustive.   The  com-
     plete  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 compiler (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 pro-
     duce 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  program  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 extension).  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  Comput-
     ers  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 tan-
     gle 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.

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