Reading a Specific Line From my Serial Buffer

Using Arduino Storage
1

Is it possible to read, from a serial buffer, a specific line instead of the whole buffer?

This part of the code:

while(USB.available()){

int bytesSent = USB.peek(); // this is the orignal that works
Serial.write(USB.read()); // this is the orignal that works

if(bytesSent == 13)
{
countline = countline + 1;
if(countline == 6) // desired line
{
Serial.println(" On Line 5");
getnextline = 1; // tells that for the next line, I have to get the data coming
}
}
if (getnextline == 1)
{
int bytesStore = USB.peek();
//Serial.println(bytesStore);
countstoring = countstoring + 1;
}
delay(1); //This delay is necessary for successful Serial transmission
}

Gives me this:

18:17:12.816 -> Opening file.
18:17:12.816 -> >File opened successfully.
18:17:12.852 -> Getting File Size
18:17:12.924 -> FileSize =4483
18:17:12.924 -> Reading file:
18:17:12.959 -> 1.000000, 0.000000, 0.000000
18:17:12.995 -> 2.000000, 0.000000, 0.000000
18:17:12.995 -> 3.000000, 0.000000, 0.000000
18:17:13.067 -> 4.000000, 0.000000, 0.000000
18:17:13.103 -> 5.000000, 0.000000, 0.000000 On Line 5
18:17:13.139 ->
18:17:13.139 -> 6.000000, 0.000000, 0.000000
18:17:13.175 -> 7.000000, 0.000000, 0.000000

But my problem is if I try to read just, for example, the data from line 5

It will give me:

18:59:48.839 -> Reading file:
18:59:48.839 -> 1.000000, 0.000000, 0.000000
18:59:48.874 -> 2.000000, 0.000000, 0.000000
18:59:48.909 -> 3.000000, 0.000000, 0.000000
18:59:48.944 -> 4.000000, 0.000000, 0.000000
18:59:48.979 -> 5.000000, 0.000000, 0.000000 On Line 5
18:59:49.047 -> 10
18:59:49.047 ->
18:59:49.047 -> 54
18:59:49.047 -> 646
18:59:49.047 -> .48

The way that I tried this was uncommenting:

if (getnextline == 1)
{
int bytesStore = USB.peek();
Serial.println(bytesStore);
countstoring = countstoring + 1;
}

In other words, from my serial read, how can I get:
"5.000000, 0.000000, 0.000000"

2

Usually end of line characters CR and LF are written to a file.
Read 4 sets of them means you are at the fifth line.