Category: Linux

Linux Server Managment

Define ssh key per host using ansible_ssh_private_key_file nixCraft

I set up SSH keys on a Linux or Unix as per my project needs and cloud hosting providers. I also new to Ansible IT automation and DevOps tool. My management node has keys for

Multiple vulnerabilities in FreeBSD NFS server code nixCraft

FreeBSD is a free and open source operating system. The NFS (Network File System) is a server and client application that turn FreeBSD into a file sharing server. Users can upload or update files on


Linux Find Out What Process Are Using Swap Space nixCraft Updated Tutorials/Posts

The top and free command display the total amount of free and used physical and swap memory in the server. How do I determine which process is using swap space under Linux operating systems? How


How to install and configure memcached on Ubuntu Linux 18.04 nixCraft

I would like to reduce the load on my MariaDB/MySQL/PostgreSQL server using memcached. How do I install and configure memcached server on Ubuntu Linux 18.04 LTS?Introduction : Memcached is a high-performance, distributed memory object caching


How To Find Out FreeBSD Version and Patch Level Number nixCraft Updated Tutorials/Posts

How do I find out my FreeBSD server version and patch level of the installed system using command line option? Can you tell us command to find out FreeBSD version and kernel patch level?Introduction :


How To Find My Public IP Address From Command Line On a Linux nixCraft Updated Tutorials/Posts

How do I find out my public IP address on the Linux and OS X Unix command line to use with my own bash shell script without using third party web site? Is there command-line


How to setup a UFW firewall on Ubuntu 18.04 LTS server nixCraft

How do I setup a firewall with UFW (uncomplicated firewall) on an Ubuntu Linux 18.04 LTS server to restrict traffic on my personal Ubuntu web-server that hosts my cat’s blog? How do I set up


Regular Expressions In grep examples nixCraft Updated Tutorials/Posts

How do I use the grep command with regular expressions on a Linux and Unix-like operating systems? How do I use grep and regular expressions to search for text/ words in Linux?Linux comes with GNU


Change Shell To Bash in Linux / Unix nixCraft Updated Tutorials/Posts

How do I switch from a ksh shell to bash on Linux or Unix system? How to change shells on Unix-like system?A shell is nothing but a command that provides a text-only user interface (also


How to configure a static IP address on RHEL 8 nixCraft

I am a new sysadmin and RHEL 8 user. My system is configured to use DHCP. How can I switch from DHCP to a static IP address on RHEL 8 system? How do I setup


How do I find out what shell I am using on Linux/Unix? nixCraft Updated Tutorials/Posts

Both Linux and Unix provides various shell out of the box. One can find bash (Bourne Again shell), ksh (Korn shell), csh (C shell)/tcsh (TC shell), sh (Bourne shell) and more installed by default. However,


Bash foreach loop examples for Linux / Unix nixCraft

I used foreach on a Unix operating system and csh shell loop. Now, I am a Linux operating system. How do I use foreach loop in bash shell running on Linux?The C shell (csh) or