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HOPE(1)                DragonFly General Commands Manual               HOPE(1)

NAME
       hope - a lazy interpreter for the functional language Hope

SYNOPSIS
       hope [ -lr ] [ -f file ] [ -t nsecs ] [ args ]

DESCRIPTION
       Hope is an interactive interpreter for a lazy variant of the functional
       language Hope.  It is most commonly run without options or arguments,
       and reads commands from the standard input, and prints results on the
       standard output.  If the standard input is a terminal, hope prompts
       with the string `>:'.  A simple use is to enter an expression,
       terminated by a semicolon.  The interpreter will respond by printing
       the value and type of the expression, < preceded by `>>'.  For example,
           >: 6*7;
           >> 42 : num

       See the documentation for more complicated uses.

OPTIONS
       These options are mainly useful for non-interactive use of the
       interpreter.

       -l     Generate a listing of the input, with embedded error messages.

       -r     The interpreter is run in restricted mode: all file I/O is
              disabled (except for reading of libraries).

       -f file
              Read input from file instead of the standard input.  This is
              useful for Hope scripts, whose first line would be
                  "#! /usr/local/bin/hope -f arg ...
              Any additional arguments will be available through the variable
              argv.

       -t n   Evaluation of any expression is interrupted if it takes more
              than n seconds.

FILES
       /usr/local/share/hope/lib
              The standard library directory.

ENVIRONMENT
       HOPEPATH
              A colon-separated list of directories to search for Hope modules
              in uses commands.  An empty entry refers to the standard library
              directory.  The default value is `.:'.

       A Hope module name is stored in a file `name.hop'.

SEE ALSO
       o      A Hope Interpreter - Reference, Ross Paterson.

       o      A Hope Tutorial, Roger Bailey.

       Both documents should be distributed with this program.

AUTHOR
       Ross Paterson <ross@soi.city.ac.uk>

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