09-15-2006
OK, what they mean is that if someone really, really wants to get data from your disks, then they can even, if the file has been removed. This does not apply to casual users, but needs to be secured in an environment where confidentiality is a high priority (finance, defence, etc). And it does not mean that you can use an undelete a file.
The data can be read because only the inode entries for a file are removed, the data sectors allocated to it are still there on the disk. But to recover the data, you need to directly read the sectors from the disk and then try to make sense of them later.
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IGREP(1) General Commands Manual IGREP(1)
NAME
igrep - search images for matching metadata
SYNOPSIS
igrep [options] pattern files...
DESCRIPTION
The igrep utility is invoked as follows:
igrep [options] pattern filename...
Where pattern is a POSIX.2 regular expression (just like the Unix/Linux grep(1) command), and filename (and any following names) specify
images or directories that should be searched. An image file will "match" if any of its metadata contains values contain substring that are
recognized regular expression. The image files may be of any format recognized by OpenImageIO (i.e., for which ImageInput plugins are
available).
Example:
$ igrep Jack *.jpg
bar.jpg: Keywords = Carly; Jack
foo.jpg: Keywords = Jack
test7.jpg: ImageDescription = Jack on vacation
For a complete description, see /usr/share/doc/libopenimageio-dev/openimageio.pdf.gz.
OPTIONS
--help Print help message
-i Ignore upper/lower case distinctions
-v Invert match (select non-matching files)
-E Pattern is an extended regular expression
-f Match against file name as well as metadata
-l List the matching files (no detail)
-r Recurse into directories
-d Print directories (when recursive)
-a Search all subimages of each file
SEE ALSO
iconvert(1), idiff(1), iinfo(1), iprocess(1), iv(1), maketx(1), oiiotool(1).
AUTHOR
OpenImageIO was written by Larry Gritz and the other authors and contributors.
This manual page was written by IRIE Shinsuke <irieshinsuke@yahoo.co.jp>, for the Debian project (and may be used by others).
May 19, 2012 IGREP(1)