Bash for ComputerCraft

--[[

________                     ___
`MMMMMMMb.                   `MM
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 MM    .M9  6MMMMb    6MMMMb\ MM 6MMb
 MMMMMMM(  8M'  `Mb  MM'    ` MMM9 `Mb
 MM    `Mb     ,oMM  YM.      MM'   MM
 MM     MM ,6MM9'MM   YMMMMb  MM    MM
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 MM    .M9 MM.  ,MM  L    ,MM MM    MM
_MMMMMMM9' `YMMM9'Yb.MYMMMM9 _MM_  _MM_

        Made for ComputerCraft
            By Relative

           Public Version 0.2

]]--
local args = {...}
local function split(pString, pPattern)
  -- Split function by Faisal Hanif
  -- http://stackoverflow.com/questions/1426954/
  local Table = {}
  local fpat = "(.-)"..pPattern
  local last_end =  1
  local s, e, cap = pString:find(fpat, 1)
  while s do
    if s ~= 1 or cap ~= "" then
      table.insert(Table,cap)
    end
    last_end = e+1
    s, e, cap = pString:find(fpat, last_end)
  end
  if last_end <= #pString then
    cap = pString:sub(last_end)
    table.insert(Table, cap)
  end
  return Table
end
function errorCheck(coden)
  local ok, err = pcall("function() "..coden.."  end")
  if not ok then return err end
  return true
end


--[[ Pre-defined Overrides ]]--
--[[ Forever  gone ]]--
local cmds = {
  print = function(line, string)
    print(string)
  end
}


--[[ Start of Interpreting ]]--
if #args ~=1 then
  print("Usage: "..shell.getRunningProgram().." <file>")
  return
end
if not fs.exists(args[1]) then
  printError("File "..args[1].." does not exist!")
  return
elseif fs.isDir(args[1]) then
  printError("File "..args[1].." is a directory.")
  return
end
local f = fs.open(shell.resolve(args[1]), "r")
if type(f) == "nil" or type(f) ~= "table" then
  printError("File "..shell.resolve(args[1]).." failed to open.")
  return
end
local lType = ""
local i = 1
while true do
  local line = f.readLine()

  if not line then
    break
  end

  local linesplit = split(line, " ")
  local cmd = linesplit[1]
  if string.sub(cmd, 1,1) == "#" or string.sub(cmd,1,2) == "//" or string.sub(cmd,1,2)=="\-\-" then
    -- interpret as comment line.
    -- you can use lua comment syntax,
    -- # you can put a hashtag(#) at the beginning of thte line
    -- you can put two slashes(//) at the beginning
  elseif cmd == "print" then
    local string = string.sub(line, 7)
    print(string)
  else
    shell.run(unpack(linesplit))
  end
  i = i + 1
end
f.close()