my-docs/Linux/Bash Script/01-Echo.md

📌 Echo Basic Usage

echo Hello, world!

Output:

Hello, world!

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💡 Common Use Cases

1. Print plain text:

   echo This is a message
   

2. Print environment variables (Linux/macOS):

   echo $HOME
   

3. Print environment variables (Windows):

   echo %USERNAME%
   

4. Write to a file:

   echo "Log entry" >> logfile.txt
   

5. Suppress newline (Unix/Linux):

   echo -n "No newline"
   

6. Use with escape characters (Unix/Linux):

   echo -e "Line1\nLine2"
   

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⚠️ Notes

• On Unix-like systems, echo is a shell builtin (e.g., in bash, sh).
• On Windows, it’s a command in cmd.exe.
• Behavior may vary slightly between environments. For complex text handling, consider using printf instead in Unix/Linux.