update lpic: head,tail,wc doc

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# 📘 **Using the `wc` Command in Linux/Unix**
`wc` (word count) is a utility that counts lines, words, and bytes or characters in files. Its useful for quickly getting file size details in text terms.
---
## ⚙️ Syntax
```bash
wc [option] file
```
---
## 🔎 Basic Usage
```bash
wc file
```
**Example output:**
```
5 6 43 file1
```
This output means:
| Number | Meaning |
| ------ | ------------------- |
| `5` | Number of **lines** |
| `6` | Number of **words** |
| `43` | Number of **bytes** |
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## 📋 Common Options
| Option | Description | Example |
| ------ | ------------------------- | ------------ |
| `-l` | Count **lines** only | `wc -l file` |
| `-w` | Count **words** only | `wc -w file` |
| `-c` | Count **bytes** only | `wc -c file` |
| `-m` | Count **characters** only | `wc -m file` |
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## 📌 Notes
* `bytes (-c)` counts raw bytes, which might differ from characters (`-m`) in multibyte encodings like UTF-8.
* Without options, `wc` outputs lines, words, and bytes by default.