Backup and hidden files?

[Kevin M. Gleason]

I created a file with cat and appended the file a little latter. When I
went to list the file (ls -a) it produced the following list:

./filename
./filename~
filename

where filename is replaced by the actual name. Are both of the ./ files
hidden with the one with the tilde (~) a backup? I guess I'm too
literal, but inquiring minds want to know!

Kevin

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