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If it's a text file, the editor you used to modify it probably kept a backup, with a slightly different name (e.g. Emacs, by default appends a ~ to the filename for the original).
thanks for the reply but i could not find any name similar to the original slightly modified. by the way i used vi editor... also there were few restarting of my macine done in between. will the file still remain there?
The files should survive reboots - they're just regular files after all. Perhaps vi doesn't enable this feature by default. You might want to read the documentation for whichever clone of vi you're using.
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