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For example consider that i have created a file temp.txt and delete it later, there is still an invisible file temp.txt~ Of course I can delete it but Why do i need to do it always, So how to avoid it..

gowtham nanda
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    ~ files are backup files created by editors like gEdit. See the preferences of the program you made the file with. SEE: http://askubuntu.com/questions/317134/how-do-i-remove-hidden-backup-files – Rinzwind Feb 08 '14 at 08:22

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The file with tilde is called backup file and made everytime you edited a file on an editor. If you want, you can recover the file from that backup. Otherwise, delete it also.

Erkin Alp Güney
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If you don't want it, open Gedit and go to Edit->Preferences->Editor and uncheck Create Backup Copy if it's checked.
Also you can open terminal and navigate to that dir then 

rm *.ext~
Zuko
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