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SKILL.md

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+---
+name: linux-ssh-operator
+description: 通过 SSH 连接并操作 Linux 服务器：执行远程命令、查看日志、管理 systemd 服务、传输文件（scp/rsync/tar/sftp）、排障。用户提到 ssh/scp/rsync、远程服务器 IP:端口、systemctl/journalctl、部署到服务器、在服务器上运行命令、远程拷贝文件 等场景时使用。
+---
+
+# Linux SSH Operator
+
+## Goal
+
+Use SSH for safe, repeatable Linux server operations.
+
+## Fast Decision
+
+1. Remote command or service check -> `scripts/ssh_run.sh`
+2. Single file copy -> `scripts/ssh_copy.sh --method scp`
+3. Directory sync or exclusions -> `scripts/ssh_copy.sh --method rsync -r`
+4. Many small files -> `scripts/ssh_copy.sh --method tar`
+5. If sudo may prompt -> add `--tty --sudo`
+
+Prefer explicit method selection when the shape is already known. It is faster and avoids bad auto guesses.
+
+## Before Acting
+
+1. Confirm `host`, `port`, `user`, and auth method.
+2. Prefer SSH keys and `~/.ssh/config` aliases.
+3. Start with read-only checks, then change, then verify.
+4. For first-connect automation, prefer `--accept-new` only when appropriate.
+5. On flaky links, set `--connect-timeout` so failed attempts return fast.
+
+## Command Runs
+
+Use `ssh_run.sh` for non-interactive commands:
+
+```bash
+ssh_run.sh my-server -- uname -a
+ssh_run.sh --tty --sudo my-server -- systemctl restart nginx
+ssh_run.sh --sudo-non-interactive my-server -- systemctl status nginx --no-pager
+```
+
+Notes:
+
+- `--sudo` is for commands that may prompt.
+- `--sudo-non-interactive` is only for passwordless sudo paths.
+
+## File Transfer
+
+Use `ssh_copy.sh` for transfers:
+
+```bash
+ssh_copy.sh --method scp push my-server ./local.txt /tmp/local.txt
+ssh_copy.sh --method rsync -r push my-server ./dir /tmp/dir
+ssh_copy.sh --method tar push my-server ./many-small-files/ /tmp/
+```
+
+Rules:
+
+- `--tar` is a packaging mode, not something to mix with `--method rsync/scp/sftp`.
+- Use `--exclude` only with `rsync`.
+- Use `--delete` only when you really want destination cleanup.
+
+## Common Ops
+
+- Disk: `df -h`, `du -sh /path/* | sort -h`
+- Memory/CPU: `free -h`, `top`, `ps aux --sort=-%mem | head`
+- Logs: `journalctl -u SERVICE -n 200 --no-pager`
+- Services: `systemctl status|restart|stop SERVICE`
+- Networking: `ss -lntp`, `ip a`, `ip r`
+
+## Safety
+
+- Never store passwords in repo files or chat logs.
+- Avoid `StrictHostKeyChecking=no`.
+- For destructive commands, ask for explicit confirmation and show the exact command first.
+
+## References
+
+- SSH security + troubleshooting: `references/ssh-playbook.md`
+
+## Scripts
+
+- `scripts/ssh_run.sh`: remote command execution with consistent options.
+- `scripts/ssh_copy.sh`: file transfer via scp/rsync/tar/sftp with consistent options.