title: How to show all colors supported by bash?
body: <p>One day, I typed the command</p>
  
  <pre><code>echo "\033[32mHELLOBASE\033[m"
  </code></pre>
  
  <p>in the gnome bash shell. The terminal showed me a green HELLOBASH string.
  I found this interesting. From my experience and serveral tests, I can change
  the number 32 from 0 up to 47. Next I wrote the following code,</p>
  
  <pre><code>for i in {0..48};do
      echo \033[$imHELLOBASH\[033m
  done
  </code></pre>
  
  <p>Of course, it doesn't work, or I cannot be here! So how to improve the above code to function?</p>