Communication with Usb

[admin]

Use this function to mount USB properly, in alerts you will get either ok or an error message. By default it mounts the first partition from USB drive to /mnt so you don't have to change anything unless you don't want it to work

Code:

function mountusb(part, mnt)
  part = part or '/dev/sda1'
  mnt = mnt or '/mnt'
  local cmd = string.format('mount %q %q 2>&1', part, mnt)
  local res, stat = io.readproc(cmd)
  return stat == 0 and true or nil, res
end

res, err = mountusb()
if res then
  alert('USB OK')
else
  alert('USB error: ' .. tostring(err))
end

Then, to read/write files you need to supply full path like /mnt/myfile.txt. Because in your case path .. 'new.txt' becomes /mntnew.txt which will be written to the main file system instead of USB drive.