Hi!

In school we just received a task.

The program can be started with numbers parameter between 1 and 9. If it is not given parameter, the program will ask user about a number between 1 and 9. Then the program should print "pyramid" using "double loop" - loop inside loop :

etc. to spoken numbers. If you manage to get this variation is even better:
etc. To spoken numbers.

Can somebody help? We are a group of 4 totally new to the linux commander.

Thanks!

Which language are you expected to use?

Bin/bash

Shellscripting :-)

So completely new to a class teaching you how to do scripting (amongst other things). So what have you done so far? Do you know how to ask the user for information? Do you know how to store that information? Do you know how to check that information is in the range 1 to 9 or that it is even a number??

I imagine the teacher did not set this on the first day without teaching you anything, so help us to understand where you are up to?

I know some few things, as making easy scripts. He went through alot in a very short time, so it wasn't easy at all.
We don't know how to ask the user for information or how to store it.
"help us to understand where you are up to?" We are making a program with shellscripting?

We have done this so far:

I just asked for help, not for people to do the task for us. If that wasn't clear enough, i'm pointing that out here.

That's more than half the job done, very good.

Now you have to check whether the first argument "$1" is between 1 and 9. If yes, assign it to x and use it as upper boundary for the first loop. Else "read x" from standard input. I assume that you already you had "if ... then ... else ... fi" in your lesson. That should bring you a bit further.

1. Telling the user what to do :- see echo

2. Getting information from the user :- see read

3. Checking the user gave you information when starting the script :- google bash command line parameters and look for $@, $# and $1..$N

4. Testing how many parameters you got :- see test and associated [[]] or (())

5. Checking you received a number :- google testing variable contains a number, this may lead you to =~ as an option

6. Check here for reasons not to use eval

7. As an alternative to your eval and a sequence, try looking up a for loop control, using the form :- counter; counter expression number;counter[inc/dec]

Hope some of that helps too. Below is a site you may wish to work through:

http://tldp.org/LDP/abs/html/ (don't let the name put you off )

This is also a guide cli tutorial http://rute.2038bug.com/index.html.gz

You may also want to try writing test scripts for each of the things mentioned by grail, before building the whole script in one.
This way you understand how each concept works.

FYI add this at the top of your scripts to see what is going on

Dette blir sett paa som juks.

Hilsen Tor L

Thanks guys! Much appriciated :-)

Will post the result here when we are done.

Now we figured out how to ask the user first.

We are still stuck on this though:

#!/bin/bash
# Test av posisjons-parametre
echo "velg et tall mellom 1 og 9:"
read


for i in {1..5}; do
for j in $(eval echo {1..$i}); do
echo -n $i
done
echo
done

exit 0

Well, you stated that:
In other words, what you need to do FIRST is to check if an argument was passed or not. If an argument was NOT passed, then you should ask for user input.

I will give you a hint with regards to the first problem (checking for an argument):
^If you are the instructor, then you ought to know that using forums to ask for help has been done in the GNU/Linux community since day one. This is not cheating, this is asking for help. Furthermore, much respect to the OP for clearly stating in the first post that this is a school project.

Best regards,
HMW

Thanks! It was not the teacher actually. Just someone in my class trolling.. But if it was - thanks for pointing out that this isn't cheating. We are looking for help to learn and to be as well prepared for exams as possible.

From what I understood we forgot to write parameters. $# for every number up to 9?

No, that's not what I meant.

Here, check this out:
https://lmddgtfy.net/?q=bash%20comma...ne%20arguments

Okey.

We are struggeling to make the program stop on the number we are choosing.

When we have 1-9 and choose 5, the program or pyramid should stop on 5, but it keeps going till 9.

This is so hard. Been stuck for hours. Sorry for dumb questions.