Homework & Coursework Questions

#!/bin/bash

clear
declare -a array

read -rp " How many cases ? " box
read -rp " shift : " n
  
array=( $(seq 1 "$box"))
tmp=${array[-2]}

for((i=$tmp;i>0;i--))
do
 	array[$i]=${array[$i -1]}
done

array[0]=$tmp

for((i=0; i<$box;i++))
do
	array[$i]
done

echo " Original array : " ${array[*]}
echo " Temporary variable : " $tmp 
echo " Array shifted : ${array[*]}"

Original array : 9 1 2 3 4 5 6 7 8 9
Temporary variable : 2
Array shifted : 9 1 2 3 4 5 6 7 8 9

Original array : 1 2 3 4 5 6  7 8 9 10 
Temporary variable : 2
Array shifted : 9 10 1 2 3 4 5 6 7 8

$ array=( $(seq 1 "$box"))
$ echo " Original array : " ${array[*]}
 Original array :  1 2 3 4 5 6 7 8 9 10
$ echo " shift:" $n
 shift: 4
$ array=( $(for ((i=n; i; i--)); do echo -n  ${array[-i]}" "; unset array[-i];  done; echo ${array[@]}) )
$ echo " array shifted : " ${array[*]}
 array shifted :  7 8 9 10 1 2 3 4 5 6

...
# print array[ ] right-shifted by n
print_array_shifted(){
  local len=${#array[@]}
  local start=$((10*len-n))
  local end=$((start+len))
  local i
  for ((i=start; i<end; i++))
  do
    echo "${array[i%len]}"
  done
}

echo " Original array : ${array[*]}"
array=( $(print_array_shifted) )
echo " Array shifted : ${array[*]}"

unset array[-i]

  Unset array[$(( ${#array[*]}-1))]

unset array[${#array[@]}-1]

arr=(${arr[@]: -2} ${arr[@]:0:$((${#arr[@]}-2))})
echo ${arr[@]}

echo ${arr[@]: -shift} ${arr[@]:0:${#arr[@]}-shift}