Solved: How to reset root password in Redhat Linux or CentOS

In this post we will discuss how to reset the root password of a Redhat linux server if you forgot it.

  • Reboot the server
  • While you are at boot menu press “Up or Down” arrow key to prevent system from booting.
  • Select the boot device and press “e” to edit it.(refer Image 1)

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Solved: Install and use rsync in Linux and Solaris – Tips and Tricks

rsync is a very useful utility which can be used to take backup or copy data from one filesystem to other. The best part with rysnc is that it considers incremental data while copying and syntax is easy.

rsync is popular with Linux and included in most versions by default. If you don’t have rsync in machine you can simply install it by following commands:-

Ubuntu / Debian

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sudo ap-get update
sudo apt-get install rsync

RHEL / CentOS

yum install rsync

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Solved: How to use nmcli for adding new IP and managing network in Redhat Linux

In our last post we have seen how to use nmtui for network management. In this post we will see how to use nmcli for doing the same activity.

“nmcli” is a command line interface. Benefit with both nmtui and nmcli is that you don’t have to update the network configuration files manually. All the required changes are done by nmtui and nmcli themselves.

Good thing with nmcli is that you don’t have to install any extra package like nmtui. nmcli is generally included with NetworkManager.

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Solved: How to change hostname using nmtui or nmcli in redhat linux

In our last post we have seen how to change hostname manually or with hostnamectl .

In this post we will discuss how to change hostname with nmtui and nmcli tools.

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In what sequence startup and shutdown RC scripts are executed in Solaris

We can use RC (Run Control) scripts present in /etc/rc* directories to start or stop a service during bootup and shutdown.

Each rc directory is associated with a run level. For example the scripts in rc3.d will be executed when the system is going in Run Level 3.

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