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$ ls -l foo*
-rw-rw-r--   1 metrica    metrica          0 Sep  6 08:02 foo
...
$ ls -l foo*
-rw-rw-r--   1 metrica    metrica          0 Sep  6 08:02 foo
-rw-rw-r--   1 metrica    metrica          0 Sep  6 08:02 foo~

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```
$ perl -pi~ -e '' foo
```