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-.\" $Id: lua.man,v 1.11 2006/01/06 16:03:34 lhf Exp $
-.TH LUA 1 "$Date: 2006/01/06 16:03:34 $"
-.SH NAME
-lua \- Lua interpreter
-.SH SYNOPSIS
-.B lua
-[
-.I options
-]
-[
-.I script
-[
-.I args
-]
-]
-.SH DESCRIPTION
-.B lua
-is the stand-alone Lua interpreter.
-It loads and executes Lua programs,
-either in textual source form or
-in precompiled binary form.
-(Precompiled binaries are output by
-.BR luac ,
-the Lua compiler.)
-.B lua
-can be used as a batch interpreter and also interactively.
-.LP
-The given
-.I options
-(see below)
-are executed and then
-the Lua program in file
-.I script
-is loaded and executed.
-The given
-.I args
-are available to
-.I script
-as strings in a global table named
-.BR arg .
-If these arguments contain spaces or other characters special to the shell,
-then they should be quoted
-(but note that the quotes will be removed by the shell).
-The arguments in
-.B arg
-start at 0,
-which contains the string
-.RI ' script '.
-The index of the last argument is stored in
-.BR arg.n .
-The arguments given in the command line before
-.IR script ,
-including the name of the interpreter,
-are available in negative indices in
-.BR arg .
-.LP
-At the very start,
-before even handling the command line,
-.B lua
-executes the contents of the environment variable
-.BR LUA_INIT ,
-if it is defined.
-If the value of
-.B LUA_INIT
-is of the form
-.RI '@ filename ',
-then
-.I filename
-is executed.
-Otherwise, the string is assumed to be a Lua statement and is executed.
-.LP
-Options start with
-.B '\-'
-and are described below.
-You can use
-.B "'\--'"
-to signal the end of options.
-.LP
-If no arguments are given,
-then
-.B "\-v \-i"
-is assumed when the standard input is a terminal;
-otherwise,
-.B "\-"
-is assumed.
-.LP
-In interactive mode,
-.B lua
-prompts the user,
-reads lines from the standard input,
-and executes them as they are read.
-If a line does not contain a complete statement,
-then a secondary prompt is displayed and
-lines are read until a complete statement is formed or
-a syntax error is found.
-So, one way to interrupt the reading of an incomplete statement is
-to force a syntax error:
-adding a
-.B ';' 
-in the middle of a statement is a sure way of forcing a syntax error
-(except inside multiline strings and comments; these must be closed explicitly).
-If a line starts with
-.BR '=' ,
-then
-.B lua
-displays the values of all the expressions in the remainder of the
-line. The expressions must be separated by commas.
-The primary prompt is the value of the global variable
-.BR _PROMPT ,
-if this value is a string;
-otherwise, the default prompt is used.
-Similarly, the secondary prompt is the value of the global variable
-.BR _PROMPT2 .
-So,
-to change the prompts,
-set the corresponding variable to a string of your choice.
-You can do that after calling the interpreter
-or on the command line
-(but in this case you have to be careful with quotes
-if the prompt string contains a space; otherwise you may confuse the shell.)
-The default prompts are "> " and ">> ".
-.SH OPTIONS
-.TP
-.B \-
-load and execute the standard input as a file,
-that is,
-not interactively,
-even when the standard input is a terminal.
-.TP
-.BI \-e " stat"
-execute statement
-.IR stat .
-You need to quote
-.I stat 
-if it contains spaces, quotes,
-or other characters special to the shell.
-.TP
-.B \-i
-enter interactive mode after
-.I script
-is executed.
-.TP
-.BI \-l " name"
-call
-.BI require(' name ')
-before executing
-.IR script .
-Typically used to load libraries.
-.TP
-.B \-v
-show version information.
-.SH "SEE ALSO"
-.BR luac (1)
-.br
-http://www.lua.org/
-.SH DIAGNOSTICS
-Error messages should be self explanatory.
-.SH AUTHORS
-R. Ierusalimschy,
-L. H. de Figueiredo,
-and
-W. Celes
-.\" EOF