2017-11-28 22:55:31 +00:00
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.\" $Id: lua.man,v 1.14 2016/10/17 15:43:50 lhf Exp $
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.TH LUA 1 "$Date: 2016/10/17 15:43:50 $"
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2015-03-24 00:00:59 +00:00
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.SH NAME
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lua \- Lua interpreter
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.SH SYNOPSIS
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.B lua
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[
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.I options
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]
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[
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.I script
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[
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.I args
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]
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]
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.SH DESCRIPTION
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.B lua
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is the standalone Lua interpreter.
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It loads and executes Lua programs,
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either in textual source form or
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in precompiled binary form.
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(Precompiled binaries are output by
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.BR luac ,
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the Lua compiler.)
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.B lua
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can be used as a batch interpreter and also interactively.
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.LP
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The given
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.I options
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are handled in order and then
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the Lua program in file
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.I script
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is loaded and executed.
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The given
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.I args
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are available to
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.I script
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as strings in a global table named
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.BR arg .
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If no options or arguments are given,
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then
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.B "\-v \-i"
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is assumed when the standard input is a terminal;
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otherwise,
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.B "\-"
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is assumed.
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.LP
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In interactive mode,
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.B lua
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prompts the user,
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reads lines from the standard input,
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and executes them as they are read.
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If the line contains an expression or list of expressions,
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then the line is evaluated and the results are printed.
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If a line does not contain a complete statement,
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then a secondary prompt is displayed and
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lines are read until a complete statement is formed or
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a syntax error is found.
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.LP
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At the very start,
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before even handling the command line,
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.B lua
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checks the contents of the environment variables
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.B LUA_INIT_5_3
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or
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.BR LUA_INIT ,
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in that order.
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If the contents is of the form
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.RI '@ filename ',
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then
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.I filename
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is executed.
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Otherwise, the string is assumed to be a Lua statement and is executed.
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.SH OPTIONS
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.TP
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.BI \-e " stat"
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execute statement
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.IR stat .
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.TP
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.B \-i
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enter interactive mode after executing
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.IR script .
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.TP
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.BI \-l " name"
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execute the equivalent of
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.IB name =require(' name ')
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before executing
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.IR script .
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.TP
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.B \-v
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show version information.
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.TP
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.B \-E
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ignore environment variables.
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.TP
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.B \-\-
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stop handling options.
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.TP
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.B \-
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stop handling options and execute the standard input as a file.
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.SH "SEE ALSO"
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.BR luac (1)
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.br
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The documentation at lua.org,
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especially section 7 of the reference manual.
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.SH DIAGNOSTICS
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Error messages should be self explanatory.
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.SH AUTHORS
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R. Ierusalimschy,
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L. H. de Figueiredo,
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W. Celes
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.\" EOF
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