Linux routing decides which gateway and interface should be used to reach another network. Older systems often used the route command; on current Linux systems, ip route is the preferred tool. View the routing table ip route A typical default route might look like default via 10.0.0.1 dev eth0. Add a temporary route sudo ip … Read more
On modern Linux systems, the easiest and safest way to install software is usually through the distribution’s package manager. It resolves dependencies, tracks installed files, and makes updates and removal much easier than manual installs. Debian and Ubuntu sudo apt update sudo apt install package-name Fedora and RHEL-family systems sudo dnf install package-name Arch Linux … Read more
scp copies files between local and remote systems over SSH. Copy a local file to a remote server Copy a remote file to the local machine Copy a directory recursively For newer workflows, rsync is often better for large folders or repeated transfers, but scp is still useful for quick secure copies.
ssh is the standard command-line tool for logging in to a remote Linux or Unix system securely. Basic login Replace user with the remote username and example.com with the server name or IP address. Use a different port Run a remote command This is useful for quick checks without opening a full interactive shell.
A modern note on the legacy Telnet protocol, why it should not be used for remote administration, and safer alternatives such as SSH.
Practical netstat examples for checking listening ports, processes and routing information on Linux.
Quick ipcalc examples for checking subnet, netmask, broadcast and host range details.
A short screen tutorial for keeping shell sessions running after disconnecting.
A “cannot mount root filesystem” or “can’t mount root fs” error usually means the kernel cannot access the root partition during boot. This can happen because of an incorrect root device, missing storage driver, filesystem issue, or bootloader configuration problem. Things to check first Was the disk or partition layout changed recently? Was the kernel … Read more
A short practical note on using umask to control default file and directory permissions in Linux.