lipc1 doc: kill command

Linux/LPIC1/17-kill.md

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+# 🗡️ Kill Command
+
+The `kill` command is used to **send signals to processes**, typically to terminate or control them.
+
+```bash
+kill [options] <PID>
+```
+
+📌 Replace `<PID>` with the Process ID of the target process.
+
+---
+
+## 🚦 Common `kill` Usage Examples
+
+### 💤 Graceful Termination — `SIGTERM` (Signal 15)
+
+```bash
+kill 123
+```
+
+✅ Politely asks the process to terminate.
+*Allows the process to clean up before exiting.*
+
+---
+
+### 🪓 Force Kill — `SIGKILL` (Signal 9)
+
+```bash
+kill -9 123
+```
+
+💥 **Immediate termination**.
+*Doesn’t allow cleanup — use only when necessary.*
+🗡️ *Think of it as the "katana" of kill commands.*
+
+---
+
+### ⌨️ Interrupt — `SIGINT` (Signal 2)
+
+```bash
+kill -2 123
+```
+
+🛑 Mimics pressing `Ctrl + C`.
+*Often used to stop processes gracefully from the terminal.*
+
+---
+
+### 🔄 Hangup — `SIGHUP` (Signal 1)
+
+```bash
+kill -1 123
+```
+
+♻️ Requests the process to **reload or restart**.
+*Commonly used for daemons or services to reload configs.*
+
+---
+
+## 📋 Summary of Signals
+
+| Signal | Name      | Description                    |
+| ------ | --------- | ------------------------------ |
+| `1`    | `SIGHUP`  | Reload configuration / restart |
+| `2`    | `SIGINT`  | Interrupt (like Ctrl + C)      |
+| `9`    | `SIGKILL` | Force kill (cannot be ignored) |
+| `15`   | `SIGTERM` | Graceful termination (default) |
+