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I created a file in Ubuntu command prompt like this

$ gedit first_file.txt 

After editing and saving the file when do ls on command prompt I can see an additional file created

first_file.txt~  

My Question

  1. What is this file and why it is created?
  2. Will it ok to tell Ubuntu not to created these files and how?
3

They are backup copies.

To control the creation of those: Edit -> Preferences -> Editor and look for "File Saving".

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