add prompts and knowledge files

data/knowledge/linux-commands.txt

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+Arch Linux package management uses pacman: pacman -Syu to update, pacman -S to install, pacman -R to remove.
+pacman -Qdt lists orphaned packages, pacman -Sc clears package cache.
+systemctl start|stop|restart|enable|disable|status service name to control systemd services.
+journalctl -xe shows detailed system logs, journalctl -u service name shows service logs.
+grep -r pattern searches recursively, grep -i ignores case, grep -v inverts match.
+find /path -name pattern -type f finds files, find with -exec runs commands on results.
+netstat -tulpn shows listening ports, ss -tulpn is the modern replacement.
+ps aux shows processes, top and htop show real time process information.
+chmod changes permissions, chown changes owner, chgrp changes group.
+ln -s creates symbolic links, mount mounts filesystems, umount unmounts.
+tar -xvf extracts, tar -cvf creates, tar -tvf lists contents of tar archives.
+awk and sed are powerful text processing tools for scripting and one-liners.
+iptables and nftables configure Linux firewall rules and packet filtering.
+perf top shows real time performance analysis of running processes.
+strace traces system calls of a process, ltrace traces library calls.
+valgrind detects memory leaks and memory errors in compiled programs.
+gcc -Wall -Wextra -Wpedantic enables all compiler warnings for C programs.
+make builds projects from Makefiles, cmake is a cross platform build system generator.
+git init creates a repository, git clone copies one, git commit saves changes.
+lspci lsusb lscpu lsblk display hardware information from sysfs and udev.
+dmesg shows kernel ring buffer messages for hardware and driver debugging.
+sysctl modifies kernel parameters at runtime, /proc and /sys expose kernel internals.