FTP

FTP (File Transfer Protocol) is a standard network protocol used to transfer files between a client and a server over a TCP-based network like the internet.


Key Features of FTP:

Client-Server Architecture: The client connects to an FTP server to upload or download files.


Authentication: Access may require a username and password, though some servers allow anonymous logins.


Active vs. Passive Mode: Active mode lets the client open a port for data transfer, while passive mode has the server handle this, improving firewall compatibility.


Command-Based Communication: Uses text commands (e.g., GET, PUT, LIST) for file operations.


Versatile File Handling: Supports transferring multiple file types and directories.


Common FTP Commands:

ftp <hostname> – Connect to an FTP server.

ls or dir – View files on the server.

cd <directory> – Navigate directories.

get <filename> – Download a file.

put <filename> – Upload a file.

bye or quit – Disconnect from the server.


FTP Alternatives:

SFTP (SSH File Transfer Protocol): Encrypts data for secure transfers.


FTPS (FTP Secure): Uses SSL/TLS encryption.


HTTP/HTTPS: Common for web-based file downloads.


Cloud Storage Services: Google Drive, Dropbox, and OneDrive offer modern alternatives.

Comments

Post a Comment

Popular posts from this blog

Absolute and relative path in HTML pages

HTML documents can have relative or absolute links to other web pages. Relative links keeps a visitor on the same web site. Relative links are pointers to other web pages on the same web site. They just contain this page filename. Absolute links on other hand contain full path including protocol and domain name to access the page. Absolute links can point to the same web site or they can point to a different web site.
Read more

Errors

It is a good idea to send errors in production environment to error log. Errors may contain sensitive information. Even so errors maybe helpful to development team or to QA team, errors need to be suppressed in production environment for viewing by everyone. Errors are good way to troubleshoot an issue therefore only trusted people can have access to this information. If not a trusted person get an access to this information, this information maybe used against the company and for a personal benefit. What to do in a case when there are more servers than one? Even so it is possible to inspect the log files in a single server, however it is impossible to do so when there is more than one server is available and web traffic is redirected to a different server each time. Log aggregation is needed in this case. All of the logs will be send to a central location. Logs may contain sensitive information. Please consult your company lawyer of how long logs can be stored, because logs can be use...
Read more

goto PHP operator

goto operator will skip execution of code and continue execution of a code that follows a label to which goto operator points to. If code has many goto operators, than this code probably needs a revision. It is possible to write code that executes without goto operators.
Read more