f  =   io.open ( "Test.txt" ,"r");
f:seek( "set" , 0 );
 for  line =  3 , f:lines()  do 
       print (line)
     end   

f = io.open("Test.txt","r");
f:seek("set",0);
for line=3, f:lines() do
      print(line)
    end

for line=20 in io.lines() do
      table.insert(lines, line)
    end

local lines = {}    -- read the lines in table 'lines'
    for line in io.lines() do
      table.insert(lines, line)
    end
    -- sort
    table.sort(lines)

  for line=2000 in io.lines() do
      table.insert(lines, line)
    end

<TICKER>,<PER>,<DATE>,<TIME>,<OPEN>,<HIGH>,<LOW>,<CLOSE>,<VOL>
LKOH [TQBR],All,20180219,181300,3727.500000,3727.500000,3722.000000,3726.500000,1106.000000
LKOH [TQBR],All,20180219,181400,3724.500000,3724.500000,3723.000000,3724.500000,789.000000
LKOH [TQBR],All,20180219,181500,3724.500000,3726.000000,3719.000000,3720.000000,1525.000000

...
 f = io.open("TQBR_LKOH_15.txt","r+"); 
  ------------------цикл перебора строк->-------------------------
   for line in f:lines() do
...

file:seek ([whence] [, offset])