Getting a table from commandline output

[Luciano de Souza <luchyanus@...>]

Hello listers,

I am trying to load a table with lines from a shell output. However, I 
am not able to understand what is wrong.

#!./usr/bin/env lua

function execute(command)
local lines = {}
local file = io.popen(command)
 while true do
line = file:read('*l')
table.insert(lines, line)
if line == nil then break
end
file:close()
return lines
end

output = execute('ls')
print(output[2])

Each line of the table  should contain a line from the output, but in 
stead of it, I have a looping.

Luciano