bash script:read doc

Linux/Bash Script/6-Read.md

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+# 📝 Bash `read` Command
+
+The `read` command in **Bash** is used to **take user input** from the terminal. It stores the input into one or more **variables**.
+
+---
+
+## 🔤 Basic Syntax
+
+```bash
+read [options] variable
+```
+
+---
+
+## 📘 Simple Example
+
+```bash
+echo "What is your name?"
+read name
+echo "Hello, $name!"
+```
+
+* `read name` takes input from the user and stores it in the variable `name`.
+* The script then greets the user with the stored input.
+
+---
+
+## 🎯 Prompt Inline with `-p`
+
+```bash
+read -p "What is your name? " name
+echo "Hello, $name!"
+```
+
+* `-p` allows you to show the prompt **on the same line** as the user input.
+
+---
+
+## 🔒 Silent Input with `-s` (e.g., Passwords)
+
+```bash
+read -sp "Enter your password: " password
+echo $password >> pass.txt
+```
+
+* `-s` hides the user’s input while typing (useful for passwords).
+* `>> pass.txt` appends the password to a file (⚠️ For demonstration only—**avoid storing passwords in plain text**!).
+
+---
+
+## ⏳ Set a Timeout with `-t`
+
+```bash
+read -t 5 -p "Enter something in 5 seconds: " data
+```
+
+* `-t 5` gives the user **5 seconds** to input something.
+* If no input is given in time, the script moves on.
+
+---
+
+## 🧠 Summary Table
+
+| Option | Description           | Example                      |
+| ------ | --------------------- | ---------------------------- |
+| `-p`   | Show prompt inline    | `read -p "Name: " name`      |
+| `-s`   | Silent (hidden input) | `read -sp "Password: " pass` |
+| `-t`   | Timeout (in seconds)  | `read -t 10 var`             |
+
+---
+
+## ✅ Quick Recap
+
+* Use `read` to get **interactive input** in your Bash scripts.
+* Combine options (`-sp`, `-tp`, etc.) for powerful input control.
+* Avoid exposing sensitive data—use secure handling practices.
+