Need help understanding conditions

Hey guys im pretty new to computercraft so this is going to likely be a simple question. I've been learning by reading other peoples codes and trying to understand why and what things do. I used someone elses code to make a door lock and it was very simple and worked just fine. I can edit it when you hold ctr-T and what i want to do is make a second password that allows acces to the terminal instead of turning off the computer.Here is the code i have in the computer
–Startup–

textutils.slowPrint("Enter Password")
password = read("*")
if password == "password" then
print("Password Accepted")
redstone.setOutput9"back", true)
sleep(5)
redstone.setOutput("back", false)
sleep(2)
os.shutdown()
end —this is where the original code ended
elseif password == "unlock" then —-this is the part i tried to add
print("Terminal Access Granted")
sleep(1)
end
end



if someone can explain whats wrong as well as why its wrong that would be great. I cant wait to learn more about the coding. Any other suggestions and explanations are welcome.

Also i had to type the code in here manually. Is there a way to copy and paste the code from tekkit so i dont have to retype it?

Original Post - Edited

–I use [.namedspoiler="name"] and [.spoiler] to hide text.
Hey guys im pretty new to computercraft so this is going to likely be a simple question. I've been learning by reading other peoples codes and trying to understand why and what things do. I used someone elses code to make a door lock and it was very simple and worked just fine. I can edit it when you hold ctr-T and what i want to do is make a second password that allows acces to the terminal instead of turning off the computer.Here is the code i have in the computer
–Startup–

 --I use [code] and [./code] (without the .) to signal a code area.
textutils.slowPrint("Enter Password")
password = read("*")
if password == "password" then
print("Password Accepted")
redstone.setOutput9"back", true)
sleep(5)
redstone.setOutput("back", false)
sleep(2)
os.shutdown()
end						 ---REMOVE THIS - elseif means you don't need that end
elseif password == "unlock" then		 ----this is the part i tried to add
print("Terminal Access Granted")
sleep(1)
end--Also REMOVE THIS
end

if someone can explain whats wrong as well as why its wrong that would be great. I cant wait to learn more about the coding. Any other suggestions and explanations are welcome.

Also i had to type the code in here manually. Is there a way to copy and paste the code from tekkit so i dont have to retype it?

Edited your post^ a small bit - also, read up on how to use the 'pastebin' program.

You just messed up the positioning of your added elseif-statement. You wrote it outside the if-statement and is not detected to interact with anything, which is why it probably throws an error.

textutils.slowPrint("Enter Password")
password = read("*")
if password == "password" then
print("Password Accepted")
redstone.setOutput9"back", true)
sleep(5)
redstone.setOutput("back", false)
sleep(2)
os.shutdown()
-- HERE WAS AN END WHICH WAS NOT NEEDED
elseif password == "unlock" then
print("Terminal Access Granted")
sleep(1)
end

By deleting this "end" the program will check (password == "unlock") if the statement(s) before (password == "password") were all false.

You missed the end on the last line. The two that need to be removed are the end before the elseif and the last end of the script.

You don't need an end after every if/elseif:

if (condition) then
  ...
elseif (condition) then
  ...
else
  ...
end