Linux & Command Line¶

Shell & Terminal¶

[[terminal-basics]] - Shells, essential commands, keyboard shortcuts, getting Linux
[[text-editors]] - nano and vim: modes, shortcuts, navigation

[[filesystem-hierarchy]] - FHS directory layout, file types, disk usage
[[file-operations]] - Create, copy, move, delete, view files and directories
[[file-search-and-grep]] - find, grep, locate, whereis, which
[[text-processing]] - wc, sort, uniq, cut, awk, sed, tr
[[io-redirection-and-pipes]] - stdin/stdout/stderr, pipes, command chaining, exit codes
[[links-and-inodes]] - Hard links, symlinks, inode structure, ext4 internals
[[file-permissions]] - chmod, chown, SUID/SGID/sticky, umask, ACLs

[[users-and-groups]] - User types, passwd/shadow/group, useradd, sudo, su
[[linux-security]] - DAC/MAC, namespaces, seccomp, malware types, pentesting tools
[[firewall-and-iptables]] - iptables chains/targets/rules, nftables, ufw

[[systemd-and-services]] - systemctl, unit files, kernel modules, hardware inspection
[[process-management]] - ps, top, htop, kill, signals, process states, priority
[[package-management]] - apt, dpkg, snap, yum/dnf, rpm, winget
[[cron-and-scheduling]] - crontab syntax, at, system time, NTP
[[disks-and-filesystems]] - Partitions, ext4, mounting, fstab, LVM, LUKS encryption
[[logging-and-journald]] - syslog, rsyslog, journalctl, logrotate, auditd
[[monitoring-and-performance]] - Memory, disk I/O, network, load average, cgroups

[[linux-kernel-and-boot]] - Kernel, modules, boot sequence, GRUB, init systems, memory
[[linux-os-structure]] - Kernel vs user space, sockets, device files, security model