title: SHELL printing just right part after . (DOT)
body: <p>I need to find just extension of all files in directory (if there are 2 same extensions, its just one). I already have it. But the output of my script is like</p>
  
  <pre><code>test.txt
  test2.txt
  hello.iso
  bay.fds
  hellllu.pdf
  </code></pre>
  
  <p>Im using grep -e -e '.' and it just highlight DOTs
  And i need just these extensions give in one variable like txt,iso,fds,pdf</p>
  
  <p>Is there anyone who could help? I already had it one time but i had it on array. Today I found out It's has to work on dash too.</p>