nixCraft - Linux and Unix tutorials for new and seasoned sysadmin

How to add bash auto completion in Ubuntu Linux

last updated November 11, 2018 in BASH Shell, Linux, Package Management, Ubuntu Linux

I set up a new Ubuntu Linux LXD container, but my auto-completion of bash shell commands are not working. How do I enable autocomplete feature in Ubuntu Linux 18.04 LTS?

Ubuntu dig command not found – How to install dig on Ubuntu

last updated November 7, 2018 in Linux, Package Management, Ubuntu Linux

I deployed Ubuntu Linux minimal deployed in the cloud. However, I am unable to find the dig command on my newly created Ubuntu 18.04 LTS server running on Google cloud. It says ‘-bash: dig: command not found‘ I tried apt install dig command, but it failed. How do I install dig command on Ubuntu Linux using the command line over ssh?

Ubuntu upgrade or update a single package using apt-get

last updated October 24, 2018 in Linux, Package Management, Ubuntu Linux

I am a new Ubuntu Linux server system administrator. I need to upgrade or update a single package using apt-get command or apt command. How do I update a specific package in Ubuntu Linux? How do I upgrade a single package using apt-get?

Ubuntu 18.04 Setup SSH Public Key Authentication

last updated October 24, 2018 in OpenBSD, Ubuntu Linux

I am a new Ubuntu 18.04 LTS user and I would like to setup ssh public key authentication. How do I set up ssh keys based authentication on Ubuntu Linux 18.04 LTS server? How do I set up SSH keys on an Ubuntu Linux 18.04 LTS server? In Ubuntu 18.04 LTS, how do I set up public key authentication?

Ubuntu 18.04 LTS change hostname permanently

last updated October 24, 2018 in Linux, Ubuntu Linux

I am a new Ubuntu Linux 18.04 LTS cloud server user. By default my serer name to ‘localhost’ during installation but now I would like to change the computer name to ‘u1804-nixcraft’. Can you tell me how do I I remove localhost and set it to u1804-nixcraft on Ubuntu 18.04 Linux? How do I change the Ubuntu computer name from ‘localhost’ to ‘u1804-nixcraft’? Can you tell me more about Ubuntu Linux change hostname command?

Check how many CPUs are there in Linux system

last updated October 15, 2018 in CentOS, Debian / Ubuntu, Hardware, Linux, RedHat and Friends, Suse

I am a new Linux user. How do you check how many CPUs are there in Linux system using the command line option?

CentOS 7 Run Script When Network Interface is Up (Network Manager)

last updated October 15, 2018 in CentOS, Linux, Networking, RedHat and Friends

I want to run a shell script or other program immediately after my network interface goes up on a CentOS 7 / RHEL 7 server. I created /sbin/ifup-local, but it is not working on a CentOS 7 box but works perfectly on CentOS 6. I am using NetworkManager with CentOS 7. How do I run ifup-post or ifup-pre scripts?