Hi, Sorry for the late reply. Yes, I want to display the checksums of files in /boot which have been modified within the last 10 minutes, and I want to do that in C. Thank you very much for pointing me to the right direction, and thank you for always be so helpful. Best regards, Wahid <div class="gmail_quote">On Tue, Mar 5, 2013 at 6:25 PM, Richard W.M. Jones <<a href="mailto:rjones@redhat.com" target="_blank">rjones@redhat.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Tue, Mar 05, 2013 at 05:04:05PM +0100, Khan Ferdous Wahid wrote: > I have upgraded my kernel as you mentioned and everything is fine > now. I wrote the following code to check the integrity of /boot > directory in guest image. Now my question is- how could I check the > integrity of files that are modified in last 10 minutes inside /boot > directory? I use boot directory as an example directory. </div>AIUI you want to display the checksums of files in /boot which have been modified within the last 10 minutes? Recursively or just to /boot directory without subdirectories? The easiest way is: virt-ls -lR -a disk --checksum --time-relative /boot | awk '$6 <= 10*60' If you want to do that in C instead of using virt-ls, then take a look at the source of virt-ls -- it is written in C. A good place to start would be here: <a href="https://github.com/libguestfs/libguestfs/blob/master/cat/virt-ls.c#L443" target="_blank">https://github.com/libguestfs/libguestfs/blob/master/cat/virt-ls.c#L443</a> especially the functions 'visit', 'show_file' and 'do_ls_lR'. I would caution you that the 'visit' function shown above would have trouble with very large directories *if* using libguestfs < 1.20. These bugs were fixed in libguestfs 1.20 and above. <div class="im"> Rich. -- Richard Jones, Virtualization Group, Red Hat <a href="http://people.redhat.com/~rjones" target="_blank">http://people.redhat.com/~rjones</a> </div>virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. <a href="http://libguestfs.org/virt-v2v" target="_blank">http://libguestfs.org/virt-v2v</a> </blockquote></div>