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third_party/lua/doc/lua.1

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+.\" $Id: lua.man,v 1.13 2011/11/16 17:16:53 lhf Exp $
+.TH LUA 1 "$Date: 2011/11/16 17:16:53 $"
+.SH NAME
+lua \- Lua interpreter
+.SH SYNOPSIS
+.B lua
+[
+.I options
+]
+[
+.I script
+[
+.I args
+]
+]
+.SH DESCRIPTION
+.B lua
+is the standalone 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
+are handled in order 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 no options or 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.
+If a line starts with
+.BR '=' ,
+then
+.B lua
+evaluates and displays
+the values of the expressions in the remainder of the line.
+.LP
+At the very start,
+before even handling the command line,
+.B lua
+checks the contents of the environment variables
+.B LUA_INIT_5_2
+or
+.BR LUA_INIT ,
+in that order.
+If the contents is of the form
+.RI '@ filename ',
+then
+.I filename
+is executed.
+Otherwise, the string is assumed to be a Lua statement and is executed.
+.SH OPTIONS
+.TP
+.BI \-e " stat"
+execute statement
+.IR stat .
+.TP
+.B \-i
+enter interactive mode after executing
+.IR script .
+.TP
+.BI \-l " name"
+execute the equivalent of
+.IB name =require(' name ')
+before executing
+.IR script .
+.TP
+.B \-v
+show version information.
+.TP
+.B \-E
+ignore environment variables.
+.TP
+.B \-\-
+stop handling options.
+.TP
+.B \-
+stop handling options and execute the standard input as a file.
+.SH "SEE ALSO"
+.BR luac (1)
+.br
+The documentation at lua.org,
+especially section 7 of the reference manual.
+.SH DIAGNOSTICS
+Error messages should be self explanatory.
+.SH AUTHORS
+R. Ierusalimschy,
+L. H. de Figueiredo,
+W. Celes
+.\" EOF