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| 1 .\" $Id: lua.man,v 1.13 2011/11/16 17:16:53 lhf Exp $ |
| 2 .TH LUA 1 "$Date: 2011/11/16 17:16:53 $" |
| 3 .SH NAME |
| 4 lua \- Lua interpreter |
| 5 .SH SYNOPSIS |
| 6 .B lua |
| 7 [ |
| 8 .I options |
| 9 ] |
| 10 [ |
| 11 .I script |
| 12 [ |
| 13 .I args |
| 14 ] |
| 15 ] |
| 16 .SH DESCRIPTION |
| 17 .B lua |
| 18 is the standalone Lua interpreter. |
| 19 It loads and executes Lua programs, |
| 20 either in textual source form or |
| 21 in precompiled binary form. |
| 22 (Precompiled binaries are output by |
| 23 .BR luac , |
| 24 the Lua compiler.) |
| 25 .B lua |
| 26 can be used as a batch interpreter and also interactively. |
| 27 .LP |
| 28 The given |
| 29 .I options |
| 30 are handled in order and then |
| 31 the Lua program in file |
| 32 .I script |
| 33 is loaded and executed. |
| 34 The given |
| 35 .I args |
| 36 are available to |
| 37 .I script |
| 38 as strings in a global table named |
| 39 .BR arg . |
| 40 If no options or arguments are given, |
| 41 then |
| 42 .B "\-v \-i" |
| 43 is assumed when the standard input is a terminal; |
| 44 otherwise, |
| 45 .B "\-" |
| 46 is assumed. |
| 47 .LP |
| 48 In interactive mode, |
| 49 .B lua |
| 50 prompts the user, |
| 51 reads lines from the standard input, |
| 52 and executes them as they are read. |
| 53 If a line does not contain a complete statement, |
| 54 then a secondary prompt is displayed and |
| 55 lines are read until a complete statement is formed or |
| 56 a syntax error is found. |
| 57 If a line starts with |
| 58 .BR '=' , |
| 59 then |
| 60 .B lua |
| 61 evaluates and displays |
| 62 the values of the expressions in the remainder of the line. |
| 63 .LP |
| 64 At the very start, |
| 65 before even handling the command line, |
| 66 .B lua |
| 67 checks the contents of the environment variables |
| 68 .B LUA_INIT_5_2 |
| 69 or |
| 70 .BR LUA_INIT , |
| 71 in that order. |
| 72 If the contents is of the form |
| 73 .RI '@ filename ', |
| 74 then |
| 75 .I filename |
| 76 is executed. |
| 77 Otherwise, the string is assumed to be a Lua statement and is executed. |
| 78 .SH OPTIONS |
| 79 .TP |
| 80 .BI \-e " stat" |
| 81 execute statement |
| 82 .IR stat . |
| 83 .TP |
| 84 .B \-i |
| 85 enter interactive mode after executing |
| 86 .IR script . |
| 87 .TP |
| 88 .BI \-l " name" |
| 89 execute the equivalent of |
| 90 .IB name =require(' name ') |
| 91 before executing |
| 92 .IR script . |
| 93 .TP |
| 94 .B \-v |
| 95 show version information. |
| 96 .TP |
| 97 .B \-E |
| 98 ignore environment variables. |
| 99 .TP |
| 100 .B \-\- |
| 101 stop handling options. |
| 102 .TP |
| 103 .B \- |
| 104 stop handling options and execute the standard input as a file. |
| 105 .SH "SEE ALSO" |
| 106 .BR luac (1) |
| 107 .br |
| 108 The documentation at lua.org, |
| 109 especially section 7 of the reference manual. |
| 110 .SH DIAGNOSTICS |
| 111 Error messages should be self explanatory. |
| 112 .SH AUTHORS |
| 113 R. Ierusalimschy, |
| 114 L. H. de Figueiredo, |
| 115 W. Celes |
| 116 .\" EOF |
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