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OCAML(1)										 OCAML(1)

       ocaml - The OCaml interactive toplevel

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

       The ocaml(1) command is the toplevel system for OCaml, that permits interactive use of the
       OCaml system through a read-eval-print loop. In this mode,  the	system	repeatedly  reads
       OCaml  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  direc-
	      tory,  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 display the secondary prompt when waiting for continuation lines  in  multi-
	      line inputs.  This should be used e.g. when running ocaml(1) in an emacs(1) window.

	      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 meth-
	      ods, 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] con-
	      structs). Programs compiled with -unsafe are therefore slightly faster, but unsafe:
	      anything	can  happen  if  the  program  accesses an array or string outside of its

	      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 OCaml user's manual, chapter "The toplevel system".

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