Linux kernel vs distributions
Open source philosophy
Why servers run Linux
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VPS providers & pricing
SSH key authentication
ssh-agent & config
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FHS (Filesystem Hierarchy Standard)
Absolute vs relative paths
Special directories: ., .., ~, /
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Creating files & directories
Reading file contents
Copying, moving, renaming
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rwx permissions: read, write, execute
User, Group, Other
Octal notation (755, 644, etc.)
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stdin, stdout, stderr
Pipes (|) — connect commands
Redirection: >, >>, <, 2>, 2>&1
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Package managers: apt (Debian/Ubuntu), dnf (Fedora/RHEL)
Repositories & sources.list
Update, install, remove, search
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Process basics: PID, PPID, states
ps, top, htop for viewing
Foreground vs background jobs
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systemd: init system & service manager
Unit types: service, socket, timer, target, path
systemctl: start, stop, enable, disable, status, restart
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Network interfaces & IP addresses
Ports, sockets, listening services
DNS resolution
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版本控制
仓库
提交
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Shebang
变量
条件判断
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镜像
容器
Dockerfile
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Pod
Deployment
Service
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Provider
Resource
Variable
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