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LUA(1)                                                                  LUA(1)



NAME
       lua - Lua interpreter

SYNOPSIS
       lua [ options ] [ script [ args ] ]

DESCRIPTION
       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 luac, the Lua compiler.)  lua can be used as a
       batch interpreter and also interactively.

       The given options (see below) are executed and then the Lua program in file script is loaded and executed.  The
       given args are available to script as strings in a global table named 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 arg start at 0, which contains the string 'script'.  The  index  of  the  last
       argument  is stored in arg.n.  The arguments given in the command line before script, including the name of the
       interpreter, are available in negative indices in arg.

       At the very start, before even handling the command line, lua executes the contents of the environment variable
       LUA_INIT,  if  it  is defined.  If the value of LUA_INIT is of the form '@filename', then filename is executed.
       Otherwise, the string is assumed to be a Lua statement and is executed.

       Options start with '-' and are described below.  You can use '--' to signal the end of options.

       If no arguments are given, then -v -i is assumed when the  standard  input  is  a  terminal;  otherwise,  -  is
       assumed.

       In  interactive  mode, 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 ';' 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 '=', then 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 _PROMPT, if
       this value is a string; otherwise, the default prompt is used.  Similarly, the secondary prompt is the value of
       the  global  variable  _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 ">> ".

OPTIONS
       -      load and execute the standard input as a file, that is, not interactively, even when the standard  input
              is a terminal.

       -e stat
              execute  statement stat.  You need to quote stat if it contains spaces, quotes, or other characters spe-
              cial to the shell.

       -i     enter interactive mode after script is executed.

       -l name
              call require('name') before executing script.  Typically used to load libraries.

       -v     show version information.

SEE ALSO
       luac(1)
       http://www.lua.org/

DIAGNOSTICS
       Error messages should be self explanatory.

AUTHORS
       R. Ierusalimschy, L. H. de Figueiredo, and W. Celes



                         $Date: 2006/01/06 16:03:34 $                   LUA(1)