How to write and read a specific line

So i am making a rpg game and i am using s = fs.open("saves", "w"). I am putting in numbers for coords such as when i hit the up button or "200" as a raw key event it does some math on y taking away 1. What i want my program to do is write in the file saves being the first line as the x coord and the second line as the y coord and then the program reading that and then plugging that into the term.setCursorPos(a, B)/> a is the final version of y and b is the final version of x. I use them to do that math such as a = y+1 or b= x+1. That way variables dont get screwed up by using x and y.


Here is my current code.

q = 1
x = 5
y = 5
term.setCursorPos(x,y)
print("@")
while true do
local event, p1 = os.pullEvent("key")
if p1 == 200 then
a = y-q
term.setCursorPos(x,a)
s = fs.open("saves", "w")
s.write(a)
s.close()
term.clear()
print("@")
end
end

and the pastebin id is VR7L6vcK

Can a key event be 200? Wouldn't the event trigger before you write 00?
Also, you might wanna quote the 200 in the if statement

yes it can be 200 it is the up arrow and the code works fine right now i just need this info and i will be able to make a unlimited movment space.

Not quite sure what you mean, but if you wand to write on different lines:

local f = fs.open( "saves", "a" )
f.writeLine("This is the first line")
f.writeLine("This is the second line")
f.close()

If you want to read line by line:

local f = fs.open( "saves", "r" )
-- Option 1:
local lines = {} --# this is just handy to have it in a table
for line in f.readLine do
   table.insert( lines, line )
end

-- Option 2:
local firstLine = f.readLine()
local secondLine = f.readLine()

f.close()

I recommend the first option if you want to read a specific line, because then you have everthing in the table and you can easily look it up.

Ok i got that but it is ssaying that it expects a number. I dont need huge specifics in case of lines just to know line 1 is x and line 2 is y. But when i plug it in to the term.setCursorPos it says expecting number or something. It isnt using the variable. here is the current code.

local f = fs.open( "saves", "r")
b = f.readLine()
a = f.readLine()
f.close()
term.setCursorPos(b,a)
print("@")
while true do
local event, p1 = os.pullEvent("key")
if p1 == 200 then
a = y-q
term.setCursorPos(x,a)
local f = fs.open( "saves", "a")
f.writeLine(a)
f.writeLine(B)/>
f.close()
term.clear()
print("@")
end
end

Nvm i got it. Thank you.