The manual page and help for the curl linux command. Curl is a tool for downloading data from a server or uploading it to a program supported by the program (DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3S, POP3S, RTMP) , RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP). This command works without user intervention.