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List all tables and contents
Other Standard Library features. example from a Well House Consultants training course
More on Other Standard Library features. [link]
Source code: basics Module: U112
This code lists all global variables (including
standard functions) in your program, descening
recursively into tables

function tellme(offset, story)
        local n,v
        for n,v in pairs(story) do
                if n ~= "loaded" and n ~= "_G" then
                io.write (offset .. n .. " " )
                print (v)
                if type(v) == "table" then
                        tellme(offset .. "--> ",v)


--[[ Sample output

[trainee@holt lm10]$ lua basics
string table: 0x9bc25b8
--> sub function: 0x9bc4d00
--> upper function: 0x9bc4d30
--> len function: 0x9bc4bf8
--> gfind function: 0x9bc4b88
--> rep function: 0x9bc4c98
--> find function: 0x9bc4ae0
--> match function: 0x9bc4c60
--> char function: 0x9bc2618
--> dump function: 0x9bc2650
--> gmatch function: 0x9bc4b88
--> reverse function: 0x9bc4cc8
--> byte function: 0x9bc25e0
--> format function: 0x9bc4b18
--> gsub function: 0x9bc4bc0
--> lower function: 0x9bc4c28
xpcall function: 0x9bc1fb0
package table: 0x9bc2a50
--> preload table: 0x9bc2f38
--> loadlib function: 0x9bc2b30
--> loaders table: 0x9bc2ba0
--> --> 1 function: 0x9bc2c40
--> --> 2 function: 0x9bc2c58
--> --> 4 function: 0x9bc2c88
--> --> 3 function: 0x9bc2c70
--> cpath ./?.so;/usr/lib/lua/5.1/?.so;/usr/lib/lua/5.1/loadall.so
--> config /
--> path ./?.lua;/usr/share/lua/5.1/?.lua;
--> seeall function: 0x9bc2b68
tostring function: 0x9bc1f08
print function: 0x9bc2020
os table: 0x9bc4208
--> exit function: 0x9bc44d8
--> setlocale function: 0x9bc24d8
--> date function: 0x9bc4430
--> getenv function: 0x9bc14e0
--> difftime function: 0x9bc4468
--> remove function: 0x9bc2488
--> time function: 0x9bc2510
--> clock function: 0x9bc43f8
--> tmpname function: 0x9bc2548
--> rename function: 0x9bc24a0
--> execute function: 0x9bc44a0
unpack function: 0x9bc1f78
require function: 0x9bc2fa0
getfenv function: 0x9bc1c48
setmetatable function: 0x9bc1e90
next function: 0x9bc1d68
assert function: 0x9bc1b98
tonumber function: 0x9bc1ed0
io table: 0x9bc3a00
--> lines function: 0x9bc3ef8
--> write function: 0x9bc4020
--> close function: 0x9bc2ab8
--> flush function: 0x9bc2ad0
--> open function: 0x9bc3f10
--> output function: 0x9bc3f48
--> type function: 0x9bc4008
--> read function: 0x9bc3fb8
--> stderr file (0xcff560)
--> stdin file (0xcff420)
--> input function: 0x9bc2ae8
--> stdout file (0xcff4c0)
--> popen function: 0x9bc3f80
--> tmpfile function: 0x9bc3fd0
rawequal function: 0x9bc2058
collectgarbage function: 0x9bc1bd0
arg table: 0x9bc5d38
--> -1 lua
--> 0 basics
getmetatable function: 0x9bc1de0
module function: 0x9bc2d20
rawset function: 0x9bc20c8
ipairs function: 0x9bc19a0
math table: 0x9bc4de8
--> log function: 0x9bc54c0
--> max function: 0x9bc54f0
--> acos function: 0x9bc51c8
--> huge inf
--> ldexp function: 0x9bc5450
--> pi 3.1415926535898
--> cos function: 0x9bc5318
--> tanh function: 0x9bc56f8
--> pow function: 0x9bc5588
--> deg function: 0x9bc5348
--> tan function: 0x9bc5730
--> cosh function: 0x9bc52e0
--> sinh function: 0x9bc5658
--> random function: 0x9bc55e8
--> randomseed function: 0x9bc5620
--> frexp function: 0x9bc5418
--> ceil function: 0x9bc52a8
--> floor function: 0x9bc53a8
--> rad function: 0x9bc55b8
--> abs function: 0x9bc5198
--> sqrt function: 0x9bc56c0
--> modf function: 0x9bc5550
--> asin function: 0x9bc5200
--> min function: 0x9bc5520
--> mod function: 0x9bc53e0
--> fmod function: 0x9bc53e0
--> log10 function: 0x9bc5488
--> atan2 function: 0x9bc5238
--> exp function: 0x9bc5378
--> sin function: 0x9bc5690
--> atan function: 0x9bc5270
debug table: 0x9bc57e8
--> getupvalue function: 0x9bc5bf0
--> debug function: 0x9bc3e10
--> sethook function: 0x9bc5c40
--> getmetatable function: 0x9bc5bd8
--> gethook function: 0x9bc3e40
--> setmetatable function: 0x9bc5cb0
--> setlocal function: 0x9bc5c78
--> traceback function: 0x9bc5d00
--> setfenv function: 0x9bc5c28
--> getinfo function: 0x9bc3e78
--> setupvalue function: 0x9bc5cc8
--> getlocal function: 0x9bc3eb0
--> getregistry function: 0x9bc5ba0
--> getfenv function: 0x9bc3e28
pcall function: 0x9bc1da0
table table: 0x9bc2828
--> setn function: 0x9bc2438
--> insert function: 0x9bc23c8
--> getn function: 0x9bc2358
--> foreachi function: 0x9bc2320
--> maxn function: 0x9bc2390
--> foreach function: 0x9bc22e8
--> concat function: 0x9bc2850
--> sort function: 0x9bc2470
--> remove function: 0x9bc2400
newproxy function: 0x9bc26b0
type function: 0x9bc1f40
coroutine table: 0x9bc2718
--> resume function: 0x9bc2880
--> yield function: 0x9bc2960
--> status function: 0x9bc28f0
--> wrap function: 0x9bc2928
--> create function: 0x9bc2868
--> running function: 0x9bc28b8
select function: 0x9bc1478
gcinfo function: 0x9bc1c10
pairs function: 0x9bc1a00
rawget function: 0x9bc2090
loadstring function: 0x9bc1d30
tellme function: 0x9bc6480
_VERSION Lua 5.1
dofile function: 0x9bc1c88
setfenv function: 0x9bc1e58
load function: 0x9bc1cf8
error function: 0x9bc1cc0
loadfile function: 0x9bc1e20
[trainee@holt lm10]$


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Lua
 * Lua Programming
 * Lua Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Lua are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Other Standard Library features." training module. You'll find a description of the topic and some other closely related examples on the "Other Standard Library features." module index page.

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Other resources
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The Horse's mouth provides a daily tip or thought.
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