[maze-le]

The file, yes, but not the file contents. Worst of all, if you opened the file recently with any process, there is a pretty good chance that the file-descriptor can be found in:

  /proc/

somewhere.

And with that in mind you can use a combination of lsof, grep, sed or any other tool to still read the file as it was.

[pritambaral]

You are correct that the file contents may remain in memory.

Neither this tool nor GNU shred nor BSD `rm -P` can do anything about it.