What Do the Colors in ls Output Mean? A Practical Guide
Blue is a directory, green is executable, red means broken or compressed. Here is the full color code for GNU ls, plus a two-minute way to prove each one to yourself.
Lynxbee topic
System Administration, Security
Upgrade Ubuntu Server or Desktop from the Command Line
Upgrading your Ubuntu installation upgrades system packages, kernel versions, and security patches to the next release. The canonical tool for performing version upgrades from the terminal is do-release-upgrade , which safely updates package repositories, handles dependencies, and cleans up obsolet
Create a Bootable USB Pen Drive for Installing Ubuntu
Creating a bootable USB pen drive is a crucial step for installing Ubuntu on your computer. This … Read more
Send Email from Linux Command Line using SSMTP (Ubuntu, Gmail, AWS)
Sending emails from the command line is a handy skill for system administrators and developers. SSMTP (Simple … Read more
How to create SSH Keys in Ubuntu / Linux ?
SSH (Secure Shell) keys are a secure and convenient way to authenticate to remote servers without the … Read more
ssh-add – Could not open a connection to your authentication agent
When working with gitlab, to push our source code server we need to add the SSH key … Read more
How to Check IP Address, Network Interface details in Linux ?
If you want to know the IP address and currently active network interfaces on Linux, we need … Read more
Solved: “is not in the sudoers file. This incident will be reported”
When we created a new user using “adduser” command, by default the user doesn’t have sudo (admin) … Read more
How to show progress bar while copying data using Rsync ?
Rsync is very good tool for copying data from remote machine in Linux. The best part of … Read more
Implementing Backup and Restore mechanism using BUP in Ubuntu
BUP is a program that backs things up. It’s short for “backup.” BUP is a Very efficient backup … Read more
How to disable and / or enable ICMP ping from Linux host ?
To disable the ICMP ping from certain Linux host, lets say which has IP of 192.168.0.100 use … Read more
How to Change Hostname for Ubuntu Machine ?
Recently, we wanted to change the hostname of our Ubuntu machine, Lets, check now what is current … Read more
Fix : Lost Sudo user in Linux
Add “Sudo” user If somehow you Lost a “sudo” user which happened to me today, after upgrading … Read more
Recover data / folder deleted with rm -rf
Today Accidentally I deleted one of my folder in ubuntu which has contained important files, but I … Read more
Add a Domain to Cloudflare Without DNS Downtime
Cloudflare’s DNS scan is only a starting point. Prevent website and email outages by exporting the authoritative zone, inventorying hidden services, handling DNSSEC in the correct order, deciding which web records should be proxied, validating the replacement zone, and changing registrar nameservers with a tested rollback.
Configure Cloudflare CDN Without Breaking Your Site
Cloudflare improves a site only when DNS, origin TLS, cache eligibility, application state, and performance features agree. Configure the proxy in layers, keep authenticated and personalized WordPress responses out of shared cache, measure each optimization, protect the origin, and retain a tested rollback.
Move a WordPress Site from HTTP to HTTPS
A WordPress HTTPS migration is more than installing a certificate. Move the site without redirect loops or broken media by validating TLS and proxy behavior, backing up, updating URLs with serialization-aware tools, fixing mixed content, publishing one-hop permanent redirects, and monitoring search and application traffic.
Mount remote filesystem over SSH in Linux
SSHFS is a file system in user space (FUSE) that uses the SSH File Transfer Protocol (SFTP) … Read more
Copy Files Between Linux Hosts with SSH
Use scp for a straightforward one-off copy, rsync over SSH for repeatable or resumable directory synchronization, SFTP for interactive/file-oriented workflows, and a tar stream for carefully controlled archive pipelines. The protocol encrypts transport; you still need host verification, least privilege, safe destination semantics, and end-to-end validation.
Setup passwordless SSH Authentication in Linux
On Local Machine, from where you will try to login another machine, we need to use ssh-keygen … Read more
Encrypt directory in Linux using Encfs
EncFS creates a virtual encrypted filesystem which stores encrypted data in the rootdir directory andmakes the unencrypted … Read more
Identify which process keeps port busy on android / Linux
Lets say you are trying to do something with UPNP which reserves port 1900 for all of … Read more
Fix Apache “ErrorDocument” 404 Failures
The message means Apache could not serve the original request and then failed again while handling that error. Test the custom error URI as an ordinary request, trace the selected virtual host and mapping, fix authorization or rewrites, and verify the final response remains 404.
Upgrade Ubuntu to the Latest Version of it
In this post, we give the process and steps required to be done to upgrade your Ubuntu … Read more