How a linguist's 1987 glue language conquered the early web, the sysadmin's toolbox, and the human genome — then froze its own momentum for fifteen years waiting on a rewrite that became a separate language. The rise, the reign, the Perl 6 schism, and the legacy that still runs in production.
Sysadmin
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The Story of Perl -
Active Directory Domain Services Fundamentals The backbone of enterprise identity, explained for the Linux admin: domains, trees, and forests; organizational units and delegation; the tight dependency on DNS; the global catalog and FSMO roles; replication topology and sites; accounts and groups and the security implications of nesting; and standing up a domain controller from scratch. How AD actually models an organization, what is new in Windows Server 2025, and where it bites you.
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Group Policy in Practice The configuration-management system every Windows shop lives on, explained for the Linux admin: GPOs and how they are processed (LSDOU and precedence), computer versus user policy, security baselines and ADMX administrative templates, loopback processing, mapped drives and login scripts, WMI filtering, and troubleshooting with gpresult and the Resultant Set of Policy. The good, the bad, the sprawl, and where it overlaps with modern Intune/MDM.
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PowerShell for Administrators The automation language Windows admins cannot avoid, for engineers fluent in bash: the object pipeline and why it beats text streams, cmdlet naming and discovery, remoting with WinRM and SSH, working with Active Directory and the registry, modules and the gallery, error handling and scripting patterns, and PowerShell on Linux. A pragmatic onramp that respects what you already know from the shell.
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Linux Networking with ip, nftables, and tc The modern Linux networking toolkit: the ip command for link, address, route, and namespace management, nftables replacing iptables with tables, chains, sets and verdict maps, and tc for traffic shaping and network emulation.
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Linux Performance Analysis Systematic Linux performance analysis: the USE method, CPU profiling with perf and flamegraphs, memory pressure with vmstat and /proc/meminfo, I/O profiling with iostat and blktrace, dynamic tracing with bpftrace one-liners, and strace for syscall inspection.
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Linux Security Hardening Baseline A practical Linux security hardening baseline: CIS Benchmark controls, kernel hardening via sysctl, AppArmor mandatory access control, seccomp syscall filtering, auditd for syscall monitoring, SSH hardening, fail2ban, unattended-upgrades, and systemd unit sandboxing.
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LVM and Linux Filesystem Comparison LVM from physical volumes through logical volumes, thin provisioning, LVM snapshots, online resize, and a practical comparison of ext4, XFS, Btrfs, and ZFS on Linux — with guidance on when to use each and how to configure them.
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PgBouncer and PostgreSQL Connection Pooling Why PostgreSQL's process-per-connection model requires a connection pooler, PgBouncer session vs transaction vs statement pooling modes and their tradeoffs, pgbouncer.ini configuration, monitoring with SHOW commands, and a comparison of PgBouncer, Pgpool-II, and Supavisor.
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systemd Deep Dive A thorough guide to systemd: unit file anatomy for Service, Timer, Socket, and Target units, dependency ordering, socket activation, journald log management, journalctl filtering, systemd-analyze for boot profiling, drop-in overrides, and user-mode systemd instances.
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IPMI and Redfish: Out-of-Band Management for Humans The second computer inside every server — the BMC — and how to drive it for out-of-band management. IPMI and its modern Redfish REST successor: power control, serial-over-LAN, sensors, and automating it all instead of clicking vendor web UIs.
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PAM Configuration Deep Dive How Linux PAM really decides whether you get a shell — the module stack, control flags, and the auth, account, session, and password phases — so you can read /etc/pam.d, add MFA or SSSD, and debug a silent login rejection.
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FlexLM and RLM License Server Internals: Debugging Denials, Borrowing, and Building License-Aware Schedulers The internals of FlexLM and RLM license servers that gate every EDA flow — how checkout works, why denials happen, how license borrowing behaves, and how to build schedulers that respect a finite pool of expensive seats.
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Perl: Still Powering the World's Sysadmin Scripts Modern Perl, CPAN, regex power, and where it still wins — an honest technical deep-dive for engineers who've heard 'Perl is dead' and want to know what's actually true.
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Linux Hardening Checklist A practical Linux hardening checklist covering CIS benchmark controls, auditd syscall monitoring, AppArmor and SELinux mandatory access control, kernel parameter tuning, and automated scoring with Lynis.
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Shell Scripting for Sysadmins: Automating the Work That Never Ends Practical shell scripting for system administrators — automating user management, log rotation and analysis, disk monitoring, service health checks, backup routines, and scheduled maintenance tasks with real, reusable scripts.
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SSH Hardening: Locking Down the Door Every Server Has Open A complete SSH hardening guide — key-based authentication, sshd configuration, ProxyJump, agent forwarding, SSH certificates, port knocking, two-factor auth, and auditing who can get in and what they can do.
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The Linux Boot Process: From Power Button to Login Prompt A thorough walkthrough of how Linux boots — from BIOS/UEFI firmware through the bootloader, kernel initialization, initramfs, systemd, and all the way to a running userspace. Includes debugging techniques for each stage.
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The Complete VPS Setup Guide: Security, Performance, and Quality of Life A comprehensive guide to setting up a VPS the right way — from choosing a vendor and hardening your first boot, to SSH mastery, firewall configuration, monitoring, backups, and quality-of-life improvements that make remote administration a pleasure.