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       ocaml - The Objective Caml interactive toplevel


       ocaml [ options ] [ object-files ] [ script-file ]


       The  ocaml(1)  command is the toplevel system for Objective Caml, that permits interactive
       use of the Objective Caml system through a read-eval-print loop. In this mode, the  system
       repeatedly  reads  Caml  phrases  from  the input, then typechecks, compiles and evaluates
       them, then prints the inferred type and result value,  if  any.  The  system  prints  a  #
       (sharp) prompt before reading each phrase.

       A toplevel phrase can span several lines. It is terminated by ;; (a double-semicolon). The
       syntax of toplevel phrases is as follows.

       The toplevel system is started by the command ocaml(1).   Phrases  are  read  on  standard
       input,  results  are  printed on standard output, errors on standard error. End-of-file on
       standard input terminates ocaml(1).

       If one or more object-files (ending in .cmo or .cma) are given, they are  loaded  silently
       before starting the toplevel.

       If  a  script-file  is  given,  phrases are read silently from the file, errors printed on
       standard error.  ocaml(1) exits after the execution of the last phrase.


       The following command-line options are recognized by ocaml(1).

       -I directory
              Add the given directory to the list of directories searched for source and compiled
              files.  By  default,  the  current  directory  is searched first, then the standard
              library directory. Directories  added  with  -I  are  searched  after  the  current
              directory,  in  the  order in which they were given on the command line, but before
              the standard library directory.

              If the given directory starts with +, it is taken relative to the standard  library
              directory.  For  instance,  -I +labltk adds the subdirectory labltk of the standard
              library to the search path.

              Directories can also be added to the search path once the toplevel is running  with
              the #directory directive.

       -init file
              Load  the  given file instead of the default initialization file.  The default file
              is .ocamlinit in the current directory if it exists, otherwise  .ocamlinit  in  the
              user's home directory.

              Labels  are  not ignored in types, labels may be used in applications, and labelled
              parameters can be given in any order.  This is the default.

              Do not compile assertion checks.  Note that the special form assert false is always
              compiled because it is typed specially.

              Ignore  non-optional  labels  in  types. Labels cannot be used in applications, and
              parameter order becomes strict.

              Do not display any prompt when waiting for input.

              Do not include the standard library directory in the list of  directories  searched
              for source and compiled files.

              Check  information  path  during  type-checking,  to  make  sure that all types are
              derived in a principal way.   When  using  labelled  arguments  and/or  polymorphic
              methods,  this  flag  is required to ensure future versions of the compiler will be
              able to infer types correctly, even if internal algorithms  change.   All  programs
              accepted  in  -principal mode are also accepted in the default mode with equivalent
              types, but different binary signatures, and this may slow down type  checking;  yet
              it is a good idea to use it once before publishing source code.

              Allow  arbitrary  recursive types during type-checking.  By default, only recursive
              types where the recursion goes through an object type are supported.

              Turn  bound  checking  off  on  array  and  string  accesses   (the   v.(i)ands.[i]
              constructs).  Programs  compiled  with  -unsafe  are therefore slightly faster, but
              unsafe: anything can happen if the program accesses an array or string  outside  of
              its bounds.

              Print version string and exit.

       -vnum  Print short version number and exit.

       -w warning-list
              Enable  or  disable warnings according to the argument warning-list.  See ocamlc(1)
              for the syntax of the warning-list argument.

       -warn-error warning-list
              Treat as errors the warnings described by the argument warning-list.  Note  that  a
              warning  is  not  triggered  (and not treated as error) if it is disabled by the -w
              option.  See ocamlc(1) for the syntax of the warning-list argument.

       -help or --help
              Display a short usage summary and exit.


              If set to iso_8859_1, accented characters (from the ISO Latin-1 character  set)  in
              string  and  character  literals  are printed as is; otherwise, they are printed as
              decimal escape sequences.

       TERM   When printing error messages, the toplevel system attempts  to  underline  visually
              the  location of the error. It consults the TERM variable to determines the type of
              output terminal and look up its capabilities in the terminal database.


       ocamlc(1), ocamlopt(1), ocamlrun(1).
       The Objective Caml user's manual, chapter "The toplevel system".