Linux & System Administration

Filesystem /boot stores kernel images, initial ramdisk (initrd/initramfs), bootloader files and config used at system startup to load the OS and recover kernels. For recovery tasks

Screenshot showing Linux terminal commands to check CPU info: cat /proc/cpuinfo, lscpu and hwinfo outputs highlighting model name, CPU cores, threads, architecture, cache and flags

sh is a POSIX-compatible minimal shell for portability; bash is a superset adding interactivity, arrays, brace expansion, process substitution and many GNU extensions. plus extras!

Diagram of reinstalling a broken package: backup configs, remove package, update repositories, reinstall pkg, verify checksums and restart services to restore proper functionality.

Graphic depicting Linux DNS cache flush methods: terminal with commands for systemd-resolve, resolvectl, dnsmasq, nscd and NetworkManager, showing sudo commands and restart steps.

Diagram of a home network showing devices connected to a router labeled Default Gateway with arrows indicating traffic flow to the internet IP addresses subnet mask and gateway IP.

How to View Network Interfaces Understanding your network infrastructure is fundamental to

Illustration of a Bash alias concept: a terminal window showing a short command mapped to a longer command string, emphasizing shortcuts, customization, and faster shell workflows.

Understanding the Critical Need for File Tracking In today's digital

Guide: Use the 'file' command, 'ls -l', and 'stat' to determine file types and metadata in Linux; inspect magic bytes, MIME type, permissions, symlinks, directories, and dev files.

Illustration of grep: searching files using regular expressions; name derived from the ed command 'g/re/p' meaning 'global /regular expression/ print' for pattern matching. widely.

Diagram showing steps to disable root SSH login: open sshd_config, set PermitRootLogin no, restart SSH service verify nonroot SSH access, and secure server with key authentication.