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Sometimes in a hurry you may move or copy a file using an already existent file name. If you aliased the cp and mv command with the -i option you are prompted for a confirmation before overwriting but if your aliases aren't there you will loose the target file!
The -b option will force the mv command to check if the destination file already exists and if it is already there a backup copy with an ending ~ is created.
There are 2 alternatives - vote for the best!
If you can do better, submit your command here.
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