Use the ftp command
From Linuxintro
- upload a file via ftp:
ftp -p -u ftp://user:password@server/path file
- download a file via ftp:
ftp -p -d ftp://user:password@server/path/file
ftp -p -u ftp://user:password@server/path file
ftp -p -d ftp://user:password@server/path/file