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FreeBSD

How to log real user’s IP address with Nginx in log files

My nginx server is behind a reverse proxy load balancer. How can I show the correct client IP address in nginx log files when nginx is behind a load balancer?
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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 secure MongoDB on Linux or Unix production server

MongoDB ransom attacks are in Wild. I am using it for storing data on my public facing cloud server powered by Ubuntu Linux. How do I protect and secure my MongoDB nosql server on Linux or Unix operating 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 assign a grep command value to a variable in Linux/Unix

How do I store grep command output in shell variable? What is the syntax to store the command output into a variable in Linux or Unix?
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How to add to bash $PATH permanently on Linux

I am a new Linux and bash shell user. How do I permanently set $PATH on Linux? How can I permanently add a directory to shell PATH on Linux?
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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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