Essential Linux skills for developers and sysadmins. File permissions, shell scripting, process management, systemd services, and server hardening best practices.
13 articles
Understand the Linux kernel features behind containers. Learn namespaces for PID, network, and mount isolation, cgroups for CPU and memory limits, and how to build a container by hand with unshare and nsenter.
Understand Linux process fundamentals: fork() and exec() for process creation, the parent-child tree, signals like SIGTERM and SIGKILL, zombie processes, the /proc filesystem, and essential debugging tools.
Master systemd unit files, dependency ordering with Wants/Requires/After, timer units as cron replacements, socket activation, and diagnostic tools like journalctl and systemd-analyze blame.
Build the mental model for Linux file permissions from scratch. Learn chmod octal and symbolic notation, chown, umask, setuid/setgid/sticky bits, and POSIX ACLs with real-world scenarios.
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