UbuntuHow to View Network Interface Hardware Info using the ethtool Command
Digging into the Physical Layer When troubleshooting network connectivity issues on a Linux server, system...
UbuntuHow to Manage Linux Services using the systemctl Command
The Evolution from Init to Systemd For decades, Linux distributions managed background services (daemons) using...
UbuntuHow to View Process Memory Usage in Linux using the pmap Command
Beyond the Top Command When a Linux server begins to run out of RAM, system...
UbuntuHow to Manage Linux Kernel Modules using the modprobe Command
The Monolithic vs. Modular Kernel Unlike early operating systems where every single hardware driver had...
UbuntuHow to Flush the Postfix Mail Queue in Linux using the postqueue Command
Managing the Mail Spool Postfix is one of the most widely used Mail Transfer Agents...
UbuntuHow to Check the Filesystem Type (ext4, xfs, btrfs) in Linux using the df Command
Identifying the Filesystem Architecture Unlike Windows, which almost exclusively relies on the NTFS filesystem, a...
UbuntuHow to Clear the Print Queue in Linux using the cancel Command
Managing the Print Spooler In a Linux environment, whether you are managing a desktop workstation...
UbuntuHow to View Failed SSH Login Attempts in Linux using the lastb Command
Detecting Brute-Force Attacks If your Linux server has port 22 (SSH) exposed to the public...
UbuntuHow to Monitor Virtual Memory Statistics in Linux using the vmstat Command
Identifying System Bottlenecks When a Linux server begins to stutter, lag, or drop database connections,...
UbuntuHow to Limit Network Bandwidth in Linux using the tc Command
The Problem of Bandwidth Hogs If you are hosting multiple services on a single Linux...
UbuntuHow to Find SUID/SGID Files in Linux for Security Auditing
The Danger of SUID and SGID Permissions In Linux, standard users are restricted from performing...
UbuntuHow to Disable the Ping (ICMP) Response in Linux using sysctl
The Security Risk of ICMP Responses By default, if you open a terminal and ping...
UbuntuHow to Find Files by Size in Linux using the find Command
Managing Linux Disk Space When a Linux server’s hard drive suddenly reaches 100% capacity, critical...
UbuntuHow to Test Disk Read Speed in Linux using the hdparm Command
Diagnosing Storage Bottlenecks When a Linux server is experiencing severe performance degradation, the CPU and...
UbuntuHow to Disable the Command History Log for a Specific Session in Linux
The Danger of the Bash History Log By default, the Linux Bash shell records every...
UbuntuHow to Display Network Interface Statistics using the ip -s link Command in Linux
The Need for Network Diagnostics When troubleshooting network performance issues on a Linux server—such as...
UbuntuHow to Check SSL Certificate Expiration Dates from the Linux Command Line using openssl
The Danger of Expired Certificates A forgotten SSL/TLS certificate is one of the most common...