2. SCP (Secure Copy).md

What is (SCP) Secure Copy 🔹

Secure Copy (SCP) is a network protocol used to securely transfer files between a local and a remote system, or between two remote systems, over an encrypted SSH connection. It ensures data integrity and confidentiality during the transfer by encrypting the files and authentication details.

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Secure Copy (SCP) 🔹

🔸 To send a single file to a specific directory on the remote server:

scp file.txt root@192.168.1.34:/root/

scp ftp-server.py root@192.168.1.31:/tmp/

Explanation:

• Copies file.txt and ftp-server.py from the local system to the specified remote directories (/root/, /tmp/).

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🔸 To transfer multiple files at once to the remote system:

scp file1.txt file2.txt root@192.168.1.34:/home/root/

scp image.png notes.md root@192.168.1.100:/var/www/html/

Explanation:

• Transfers multiple files (file1.txt, file2.txt, image.png, notes.md) to the specified directory on the remote server.

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🔸 To recursively copy an entire directory and its contents from the local system to the remote system:

scp -r /local/dir root@192.168.1.34:/remote/dir

scp -r ~/Downloads root@192.168.1.34:/tmp/

Explanation:

• Uses the -r option to copy a directory and its contents recursively from the local system to the remote server.

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🔸 To copy a file or folder from the remote server to the local machine:

scp root@192.168.1.34:/root/file.txt ./local/dir/

scp -r root@192.168.1.34:/var/www/html/ /tmp/

Explanation:

• Copies a file or directory from the remote server to the local machine. The -r option is used for directories.

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🔸 To set a bandwidth limit during transfer (useful for slow networks):

scp -l 500 file.zip root@192.168.1.20:/tmp/

Explanation:

• The -l option sets a bandwidth limit in kilobits per second (500 kbps in this case) to prevent network congestion.

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Conclusion on Secure Copy (SCP) 🔹

1. Secure File Transfer:
   SCP securely transfers files using an encrypted SSH connection.

2. Data Integrity:
   It encrypts files and authentication details, ensuring protection from unauthorized access.

3. Multiple File Transfers:
   SCP supports transferring multiple files simultaneously.

4. Directory Transfer:
   With -r, SCP can copy entire directories and their contents.

5. Local and Remote Transfers:
   SCP supports both local-to-remote and remote-to-local file transfers.

6. Bandwidth Limiting:
   The -l option lets you set bandwidth limits for transfers.

7. Simplicity and Security:
   SCP is easy to use and ensures secure file transfer via SSH.

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