title: Shell script prime text
body: <p>I'm trying to "traduce" from Python (<a href="https://stackoverflow.com/questions/1801391/what-is-the-best-algorithm-for-checking-if-a-number-is-prime">What is the best algorithm for checking if a number is prime?</a>) to Shell Script. This is my idea (probably very silly code):</p>
  
  <pre><code>#!/bin/bash
  prime (){
  i=5
  w=2
  while [ `echo "$i*$i" | bc -l ` -le $n ]
      do
        if [ n % i -eq 0 ]
          then echo "$n is not prime"
        else
          i = i + w
          w = 6 - w
          echo "$n is prime"
      fi
  done
  }
  echo "Test for knowing if a number is prime or not."
  sleep 2
  echo "Enter the number"
  read n
  if [ $n -eq 1 ]
     then echo "Number 1 is not prime"
  elif [ $n -eq 2 ]
     then echo "Number two is prime"
  elif [ $n -eq 3 ]
     then echo "Number three is prime"
  else
     prime
  fi
  </code></pre>
  
  <p>The problem is when i put any other number (4, 5, 6, ...) the program doesn't return back if $n is prime or not. If anyone can help me, I will be very grateful.</p>