As I mentioned in the previous post there are simple techniques that can recover your deleted file (by using simple 'grep' or 'strings' utilities).
Even some data recovery tools does the same thing. So if you want to delete some data on the disk without being worried about the retrieval, then
you should probably over write the disk which has your file content.
shred utility available in Linux does...
Educating yourself does not mean that you were stupid in the first place; it means that you are intelligent enough to know that there is plenty left to 'learn'. -Melanie Joy
Saturday, 31 January 2015
How to recover a file that was removed using 'rm' command ?
In Unix like file systems, the system uses 'hard links' to point to piece of data that you write to the disk.
So when you create a file, you also create its first hard link. You can create multiple hard links using 'ln' command.
When you "delete" a file using rm command, normally you are only deleting the hard link.
If all hard links to a particular file are deleted, then the system removes only...
Thursday, 29 January 2015
Calculating time differences in python
Recently I had a situation where I need to calculate the timer efficiency.
I have a C++ timer that calls my function after every 5 sec. My function does some critical operation and logs one statement to syslog.
When I observed the logs I found that there is delay in my function execution, slowly the timer started drifting in result and the next function calls are getting delayed !!
So I wanted...