Simplified version of FTP using socket programming, UNIX system calls. FTP client-server with all functionalities of standard FTP.
I have also implemented [multi-threaded FTP Client][1].

Following functions are included. For example:
ls : To list files in current directory on server side.
ls -l : Same as ls, with some more details.
pwd : Current working directory on server side.
get filename : Download file from server.(File should be present on server side).
put filename : Upload file on server.
uniqput filename : Uniquely upload file on server.
mkdir directory_name : Create directory on server.
rmdir directory_name : Remove directory on server.
rm filename : Remove file on server.
cd directory_name : Traverse file system on server side.
rename old_filename new_filename : Renaming file on server.

!ls : To list files in current directory on client side.
!ls -l : Same as !ls, with some more details.
!pwd : Current working directory on client side.
!cd directory_name : Traverse file system on client side.
!mkdir directory_name : Create directory on client side.
!rmdir directory_name : Remove directory on client side.
[1]: https://github.com/rohit-takhar/Multithreaded-ftp-client-in-C

To run:
Run server-executable on one system and access through client, running on other system.
Or you can use loopback address for using same system as client and server.