Archive for the 'Data recovery' Category

Linux: Recovering deleted /etc/shadow password file
Sometime by accident you may delete /etc/shadow file. If you boot into single user mode, system will ask root password for maintenance, and just imagine you do not have a backup of /etc/shadow file. How do you fix such problem in a production environment where time is critical factor? I will explain how to recover [...]
How Do I Make Linux / UNIX Filesystem Backup With dd?

Explains how to make a backup (track by track) using dd command under UNIX / Linux operating system.
Repairing Linux ext2 or ext3 file system
1) File system must be unmounted, you cannot repair it while it is running. Take system down to runlevel one (make sure you run all command as root user):
# init 1
2)Unmount file system, for example if it is /home (/dev/sda3) file system then type command:
# umount /home
OR
# umount /dev/sda3
3) Now run fsck on the partition:
# [...]
Linux or UNIX Recover deleted files - undelete files
If you rum rm command accidentally and deleted important a file, recovery becomes critical under Linux and/or UNIX oses.
Since Linux is multiuser and multitasking operating system other users/process can overwrite deleted file disk space. So you need to take down system to single user mode.
First use wall (only the super-user can write on the [...]