update lpic: head,tail,wc doc

Linux/LPIC1/14-head-tail.md

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+# 📘 **Using `head` and `tail` Commands in Linux/Unix**
+
+Both `head` and `tail` are essential commands for viewing specific portions of a file quickly, without opening the entire file.
+
+---
+
+## 🔝 `head` — Show the Top of a File
+
+The `head` command displays the beginning part of a file.
+
+### Syntax
+
+```bash
+head [options] file
+```
+
+### Examples
+
+```bash
+head file1
+```
+
+**Description**:
+Displays the first 10 lines of `file1` (default behavior).
+
+```bash
+head -n 5 file1
+```
+
+**Description**:
+Shows the first 5 lines of `file1`.
+
+---
+
+## 🔚 `tail` — Show the Bottom of a File
+
+The `tail` command displays the end part of a file.
+
+### Syntax
+
+```bash
+tail [options] file
+```
+
+### Examples
+
+```bash
+tail file1
+```
+
+**Description**:
+Displays the last 10 lines of `file1` (default behavior).
+
+```bash
+tail -n 20 file1
+```
+
+**Description**:
+Shows the last 20 lines of `file1`.
+
+```bash
+tail -f file1
+```
+
+**Description**:
+Follows the file as it grows — useful for watching logs in real-time.
+
+---
+
+## ✅ Summary of Options
+
+| Command | Option        | Description                                 |
+| ------- | ------------- | ------------------------------------------- |
+| `head`  | `-n <number>` | Show the first `<number>` lines             |
+| `tail`  | `-n <number>` | Show the last `<number>` lines              |
+| `tail`  | `-f`          | Follow the file in real-time (live updates) |
+