I'm having some trouble in completing an assignment about advanced bash shell, nothing I do seems to work. Below are the instructions for it:

- Write some code in advscript.sh that will create two empty text files in the current directory, named input.txt and output.txt

- Add some code to advscript.sh that will insert 1000 lines of text into the input.txt file. Each line of text will consist of a three-digit number, and every line will contain a unique number. Start with 000, and count up to 999.

- Add some more code to advscript.sh that will read input.txt line-by-line. Add up the three digits on each line, and determine whether the resulting sum is "odd" or "even". Output each number line-by-line, along with odd or even appended to the end into output.txt

Additional "hints":

- The easiest way to create zero-padded consecutive numbers like these is by using "brace expansion". While you could use nested loops as well, that method will be a lot more cumbersome.

- Use a redirect to echo text into the files. Remember that one type of redirect overwrites the entire contents of the file, while the other redirect simply appends to the file.

- Use the "touch" command (touch filename.txt) or simply the redirect operator by itself (> filename.txt) to create the empty files.

- To determine whether a number is even, use the modulus operator (%) with a divisor of 2. If the result of this operation equals zero, you know that the number is even. If the modulus result doesn't equal zero, then the number is odd.