How to recover root password linux

[Carlos16]

Hi,
I am not so expert on linux based operating system. The first thing I want to know is that how to recover the root password in it. If a use by accidentally forgets it the what are the possibilities to get it. Second things how can I add a partition to an existing directory. And the last thing I want to know how to run commands as root logged in as normal user.

[SalVatore]

There are several methods (including SUID), but I will mention here that the method sudo. Run the visudo command which will actually launch your favorite editor to edit the file / etc / sudo. You can then add the line: nom_utilisateur ALL=(ALL) NOPASSWD:ALL. The specified user can now execute commands reserved for root by typing: $ sudo command. The parameter "NOPASSWD" tells sudo it should request the password of the user before running the command.

[Devasis]

It is not possible to recover the root password. But you can change this password if you have physical access to the computer. You must first find a way to access a console (using a live CD distribution like Knoppix, boot cd install linux, etc.). Then mount the root partition of your linux in a directory: # mount -t ext2 /dev/hda1 /mnt. Run the commands: # cd /mnt # chroot /mnt. It'll just change the password: # password root. Now you can restart linux and use your new password for root.

[Solomon]

The problem is simple: no LVM and distribution increasingly tight, no way to resize the partitions so it creates another (on another disk or there's the place for example) and copy it to a large partition that takes up space as / usr. It starts in single mode init s. Creating a filesystem on the new partition + directory to copy the contents mkfs.ext3 /dev/hdxx mkdir -p /mnt/new_usr.

[MrChris-]

We mount the new partition and it copies the data on the new partition mount /dev/hdxx /mnt/new_usr cp -arf /usr/* /mnt/new_usr/. Adds good online fstab echo "/dev/hdxx /usr ext3 defaults 1 1" >> /etc/fstab. It removes what has been copied: attention better wait until you have verified that it works before making this manip 'delicate quque either partition rm -rf /usr/*.

[Calvin K]

The above process dismantles the partition that was created for the sole purpose of copying / usr (or our directory you climb that we just copy it and delete the directory / mnt created for the occasion umount /mnt/new_usr mount /usr rmdir /mnt/new_usr. It can restart the system or by a reboot or putting the usual runlevel reboot ( ou init X )