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


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?

They are backup copies.

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

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