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I configured and use my openssh server to accept only public key based authentication. I need to test if my server accepting password. How to allow ssh client to use only password auth when pubkey auth configured?
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How to copy a single file to multiple directories in Linux or Unix

If I want to copy a single file into three locations (directories), by using a single cp command (e.g. cp file /dir1/ /dir2/ /dir3/. Would that be possible? If yes, please provide the command for GNU/Linux or Unix operating systems.
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Linux / Unix: “-bash: python: command not found” error and solution

I am a new user and trying to run Python program. I have a cloud based VM/VPS and when I type python mycode.py at the terminal of my server, I get the following error:
-bash: python: command not found

How do I solve this problem?
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Change Shell To Bash

How do I switch from a ksh shell to bash on Linux or Unix system? How to change shells on Unix-like system?
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How to change the ssh port on Linux or Unix server

I am a new Linux/Unix server admin. How do I change the SSH Port for my Linux or Unix server using command line option?
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How to install wget on RHEL/CentOS 7 using yum

I am trying to download a file using ‘wget http://url’ syntax, but I am getting an error:

bash: wget: command not found

How do I fix this problem? How can I install wget on a CentOS/RHEL 7 or 6 server using yum command?
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How to check if port is in use on Linux or Unix

How do I determine if a port is in use under Linux or Unix-like system? How can I verify which ports are listening on Linux server?
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How to delete KVM VM guest using virsh command

I am a new Linux and KVM user. How do I delete a VM guest with virsh command line on Linux operating system? How do I delete a virtual machine called vps42 on Ubuntu or CentOS Linux server?
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A very serious security problem has been found in the Linux kernel. A 0-day local privilege escalation vulnerability has existed for eleven years since 2005. This bug affects all sort of of Android or Linux kernel to escalate privileges. Any user can become root in less than 5 seconds. The bug has existed since Linux kernel version 2.6.22+. How do I fix this problem?
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How to create snapshot in Linux KVM VM/Domain

Before upgrading my virtual machine, I would like to make a snapshot. I want to revert a domain/VM to a snapshot if something goes wrong with my upgrade. Is there a command to create a snapshot of virtual machine (VM) while it is running? Does qemu-kvm support live snapshot creation?
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