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1 | <!-- $Id: lua.man,v 1.11 2006/01/06 16:03:34 lhf Exp $ --> | ||
2 | <HTML> | ||
3 | <HEAD> | ||
4 | <TITLE>LUA man page</TITLE> | ||
5 | <LINK REL="stylesheet" TYPE="text/css" HREF="lua.css"> | ||
6 | </HEAD> | ||
7 | |||
8 | <BODY BGCOLOR="#FFFFFF"> | ||
9 | |||
10 | <H2>NAME</H2> | ||
11 | lua - Lua interpreter | ||
12 | <H2>SYNOPSIS</H2> | ||
13 | <B>lua</B> | ||
14 | [ | ||
15 | <I>options</I> | ||
16 | ] | ||
17 | [ | ||
18 | <I>script</I> | ||
19 | [ | ||
20 | <I>args</I> | ||
21 | ] | ||
22 | ] | ||
23 | <H2>DESCRIPTION</H2> | ||
24 | <B>lua</B> | ||
25 | is the stand-alone Lua interpreter. | ||
26 | It loads and executes Lua programs, | ||
27 | either in textual source form or | ||
28 | in precompiled binary form. | ||
29 | (Precompiled binaries are output by | ||
30 | <B>luac</B>, | ||
31 | the Lua compiler.) | ||
32 | <B>lua</B> | ||
33 | can be used as a batch interpreter and also interactively. | ||
34 | <P> | ||
35 | The given | ||
36 | <I>options</I> | ||
37 | (see below) | ||
38 | are executed and then | ||
39 | the Lua program in file | ||
40 | <I>script</I> | ||
41 | is loaded and executed. | ||
42 | The given | ||
43 | <I>args</I> | ||
44 | are available to | ||
45 | <I>script</I> | ||
46 | as strings in a global table named | ||
47 | <B>arg</B>. | ||
48 | If these arguments contain spaces or other characters special to the shell, | ||
49 | then they should be quoted | ||
50 | (but note that the quotes will be removed by the shell). | ||
51 | The arguments in | ||
52 | <B>arg</B> | ||
53 | start at 0, | ||
54 | which contains the string | ||
55 | '<I>script</I>'. | ||
56 | The index of the last argument is stored in | ||
57 | <B>arg.n</B>. | ||
58 | The arguments given in the command line before | ||
59 | <I>script</I>, | ||
60 | including the name of the interpreter, | ||
61 | are available in negative indices in | ||
62 | <B>arg</B>. | ||
63 | <P> | ||
64 | At the very start, | ||
65 | before even handling the command line, | ||
66 | <B>lua</B> | ||
67 | executes the contents of the environment variable | ||
68 | <B>LUA_INIT</B>, | ||
69 | if it is defined. | ||
70 | If the value of | ||
71 | <B>LUA_INIT</B> | ||
72 | is of the form | ||
73 | '@<I>filename</I>', | ||
74 | then | ||
75 | <I>filename</I> | ||
76 | is executed. | ||
77 | Otherwise, the string is assumed to be a Lua statement and is executed. | ||
78 | <P> | ||
79 | Options start with | ||
80 | <B>'-'</B> | ||
81 | and are described below. | ||
82 | You can use | ||
83 | <B>'--'</B> | ||
84 | to signal the end of options. | ||
85 | <P> | ||
86 | If no arguments are given, | ||
87 | then | ||
88 | <B>"-v -i"</B> | ||
89 | is assumed when the standard input is a terminal; | ||
90 | otherwise, | ||
91 | <B>"-"</B> | ||
92 | is assumed. | ||
93 | <P> | ||
94 | In interactive mode, | ||
95 | <B>lua</B> | ||
96 | prompts the user, | ||
97 | reads lines from the standard input, | ||
98 | and executes them as they are read. | ||
99 | If a line does not contain a complete statement, | ||
100 | then a secondary prompt is displayed and | ||
101 | lines are read until a complete statement is formed or | ||
102 | a syntax error is found. | ||
103 | So, one way to interrupt the reading of an incomplete statement is | ||
104 | to force a syntax error: | ||
105 | adding a | ||
106 | <B>';'</B> | ||
107 | in the middle of a statement is a sure way of forcing a syntax error | ||
108 | (except inside multiline strings and comments; these must be closed explicitly). | ||
109 | If a line starts with | ||
110 | <B>'='</B>, | ||
111 | then | ||
112 | <B>lua</B> | ||
113 | displays the values of all the expressions in the remainder of the | ||
114 | line. The expressions must be separated by commas. | ||
115 | The primary prompt is the value of the global variable | ||
116 | <B>_PROMPT</B>, | ||
117 | if this value is a string; | ||
118 | otherwise, the default prompt is used. | ||
119 | Similarly, the secondary prompt is the value of the global variable | ||
120 | <B>_PROMPT2</B>. | ||
121 | So, | ||
122 | to change the prompts, | ||
123 | set the corresponding variable to a string of your choice. | ||
124 | You can do that after calling the interpreter | ||
125 | or on the command line | ||
126 | (but in this case you have to be careful with quotes | ||
127 | if the prompt string contains a space; otherwise you may confuse the shell.) | ||
128 | The default prompts are "> " and ">> ". | ||
129 | <H2>OPTIONS</H2> | ||
130 | <P> | ||
131 | <B>-</B> | ||
132 | load and execute the standard input as a file, | ||
133 | that is, | ||
134 | not interactively, | ||
135 | even when the standard input is a terminal. | ||
136 | <P> | ||
137 | <B>-e </B><I>stat</I> | ||
138 | execute statement | ||
139 | <I>stat</I>. | ||
140 | You need to quote | ||
141 | <I>stat </I> | ||
142 | if it contains spaces, quotes, | ||
143 | or other characters special to the shell. | ||
144 | <P> | ||
145 | <B>-i</B> | ||
146 | enter interactive mode after | ||
147 | <I>script</I> | ||
148 | is executed. | ||
149 | <P> | ||
150 | <B>-l </B><I>name</I> | ||
151 | call | ||
152 | <B>require</B>('<I>name</I>') | ||
153 | before executing | ||
154 | <I>script</I>. | ||
155 | Typically used to load libraries. | ||
156 | <P> | ||
157 | <B>-v</B> | ||
158 | show version information. | ||
159 | <H2>SEE ALSO</H2> | ||
160 | <B>luac</B>(1) | ||
161 | <BR> | ||
162 | <A HREF="http://www.lua.org/">http://www.lua.org/</A> | ||
163 | <H2>DIAGNOSTICS</H2> | ||
164 | Error messages should be self explanatory. | ||
165 | <H2>AUTHORS</H2> | ||
166 | R. Ierusalimschy, | ||
167 | L. H. de Figueiredo, | ||
168 | and | ||
169 | W. Celes | ||
170 | <!-- EOF --> | ||
171 | </BODY> | ||
172 | </HTML> | ||