aria2c --version (return code: 0)
aria2 version 1.32.0 Copyright (C) 2006, 2016 Tatsuhiro Tsujikawa This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. ** Configuration ** Enabled Features: Async DNS, BitTorrent, Firefox3 Cookie, GZip, HTTPS, Message Digest, Metalink, XML-RPC Hash Algorithms: sha-1, sha-224, sha-256, sha-384, sha-512, md5, adler32 Libraries: zlib/1.2.11 libxml2/2.9.4 sqlite3/3.16.2 GnuTLS/3.5.8 nettle GMP/6.1.2 c-ares/1.12.0 Compiler: gcc 6.3.0 20170519 built by x86_64-pc-linux-gnu on Jun 19 2017 14:04:28 System: Linux 4.10.0-35-generic #39-Ubuntu SMP Wed Sep 13 07:46:59 UTC 2017 x86_64 Report bugs to https://github.com/aria2/aria2/issues Visit https://aria2.github.io/
aria2c --help (return code: 0)
Usage: aria2c [OPTIONS] [URI | MAGNET | TORRENT_FILE | METALINK_FILE]... Printing options tagged with '#basic'. See 'aria2c -h#help' to know all available tags. Options: -v, --version Print the version number and exit. Tags: #basic -h, --help[=TAG|KEYWORD] Print usage and exit. The help messages are classified with tags. A tag starts with "#". For example, type "--help=#http" to get the usage for the options tagged with "#http". If non-tag word is given, print the usage for the options whose name includes that word. Possible Values: #basic, #advanced, #http, #https, #ftp, #metalink, #bittorrent, #cookie, #hook, #file, #rpc, #checksum, #experimental, #deprecated, #help, #all Default: #basic Tags: #basic, #help -l, --log=LOG The file name of the log file. If '-' is specified, log is written to stdout. Possible Values: /path/to/file, - Tags: #basic -d, --dir=DIR The directory to store the downloaded file. Possible Values: /path/to/directory Default: /tmp/sandpit Tags: #basic, #file -o, --out=FILE The file name of the downloaded file. It is always relative to the directory given in -d option. When the -Z option is used, this option will be ignored. Possible Values: /path/to/file Tags: #basic, #http, #ftp, #file -s, --split=N Download a file using N connections. If more than N URIs are given, first N URIs are used and remaining URLs are used for backup. If less than N URIs are given, those URLs are used more than once so that N connections total are made simultaneously. The number of connections to the same host is restricted by the --max-connection-per-server option. See also the --min-split-size option. Possible Values: 1-* Default: 5 Tags: #basic, #http, #ftp --file-allocation=METHOD Specify file allocation method. 'none' doesn't pre-allocate file space. 'prealloc' pre-allocates file space before download begins. This may take some time depending on the size of the file. If you are using newer file systems such as ext4 (with extents support), btrfs, xfs or NTFS (MinGW build only), 'falloc' is your best choice. It allocates large(few GiB) files almost instantly. Don't use 'falloc' with legacy file systems such as ext3 and FAT32 because it takes almost same time as 'prealloc' and it blocks aria2 entirely until allocation finishes. 'falloc' may not be available if your system doesn't have posix_fallocate() function. 'trunc' uses ftruncate() system call or platform-specific counterpart to truncate a file to a specified length. Possible Values: none, prealloc, trunc, falloc Default: prealloc Tags: #basic, #file -V, --check-integrity[=true|false] Check file integrity by validating piece hashes or a hash of entire file. This option has effect only in BitTorrent, Metalink downloads with checksums or HTTP(S)/FTP downloads with --checksum option. If piece hashes are provided, this option can detect damaged portions of a file and re-download them. If a hash of entire file is provided, hash check is only done when file has been already download. This is determined by file length. If hash check fails, file is re-downloaded from scratch. If both piece hashes and a hash of entire file are provided, only piece hashes are used. Possible Values: true, false Default: false Tags: #basic, #metalink, #bittorrent, #file, #checksum -c, --continue[=true|false] Continue downloading a partially downloaded file. Use this option to resume a download started by a web browser or another program which downloads files sequentially from the beginning. Currently this option is only applicable to http(s)/ftp downloads. Possible Values: true, false Default: false Tags: #basic, #http, #ftp -i, --input-file=FILE Downloads URIs found in FILE. You can specify multiple URIs for a single entity: separate URIs on a single line using the TAB character. Reads input from stdin when '-' is specified. Additionally, options can be specified after each line of URI. This optional line must start with one or more white spaces and have one option per single line. See INPUT FILE section of man page for details. See also --deferred-input option. Possible Values: /path/to/file, - Tags: #basic -j, --max-concurrent-downloads=N Set maximum number of parallel downloads for every static (HTTP/FTP) URL, torrent and metalink. See also --split and --optimize-concurrent-downloads options. Possible Values: 1-* Default: 5 Tags: #basic -Z, --force-sequential[=true|false] Fetch URIs in the command-line sequentially and download each URI in a separate session, like the usual command-line download utilities. Possible Values: true, false Default: false Tags: #basic -x, --max-connection-per-server=NUM The maximum number of connections to one server for each download. Possible Values: 1-16 Default: 1 Tags: #basic, #http, #ftp -k, --min-split-size=SIZE aria2 does not split less than 2*SIZE byte range. For example, let's consider downloading 20MiB file. If SIZE is 10M, aria2 can split file into 2 range [0-10MiB) and [10MiB-20MiB) and download it using 2 sources(if --split >= 2, of course). If SIZE is 15M, since 2*15M > 20MiB, aria2 does not split file and download it using 1 source. You can append K or M(1K = 1024, 1M = 1024K). Possible Values: 1048576-1073741824 Default: 20M Tags: #basic, #http, #ftp --ftp-user=USER Set FTP user. This affects all URLs. Tags: #basic, #ftp --ftp-passwd=PASSWD Set FTP password. This affects all URLs. Tags: #basic, #ftp --http-user=USER Set HTTP user. This affects all URLs. Tags: #basic, #http --http-passwd=PASSWD Set HTTP password. This affects all URLs. Tags: #basic, #http --load-cookies=FILE Load Cookies from FILE using the Firefox3 format and Mozilla/Firefox(1.x/2.x)/Netscape format. Possible Values: /path/to/file Tags: #basic, #http, #cookie -S, --show-files[=true|false] Print file listing of .torrent, .meta4 and .metalink file and exit. More detailed information will be listed in case of torrent file. Possible Values: true, false Default: false Tags: #basic, #metalink, #bittorrent --max-overall-upload-limit=SPEED Set max overall upload speed in bytes/sec. 0 means unrestricted. You can append K or M(1K = 1024, 1M = 1024K). To limit the upload speed per torrent, use --max-upload-limit option. Possible Values: 0-* Default: 0 Tags: #basic, #bittorrent -u, --max-upload-limit=SPEED Set max upload speed per each torrent in bytes/sec. 0 means unrestricted. You can append K or M(1K = 1024, 1M = 1024K). To limit the overall upload speed, use --max-overall-upload-limit option. Possible Values: 0-* Default: 0 Tags: #basic, #bittorrent -T, --torrent-file=TORRENT_FILE The path to the .torrent file. Possible Values: /path/to/file Tags: #basic, #bittorrent --listen-port=PORT... Set TCP port number for BitTorrent downloads. Multiple ports can be specified by using ',', for example: "6881,6885". You can also use '-' to specify a range: "6881-6999". ',' and '-' can be used together. Possible Values: 1024-65535 Default: 6881-6999 Tags: #basic, #bittorrent --enable-dht[=true|false] Enable IPv4 DHT functionality. It also enables UDP tracker support. If a private flag is set in a torrent, aria2 doesn't use DHT for that download even if ``true`` is given. Possible Values: true, false Default: true Tags: #basic, #bittorrent --dht-listen-port=PORT... Set UDP listening port used by DHT(IPv4, IPv6) and UDP tracker. Multiple ports can be specified by using ',', for example: "6881,6885". You can also use '-' to specify a range: "6881-6999". ',' and '-' can be used together. Possible Values: 1024-65535 Default: 6881-6999 Tags: #basic, #bittorrent --enable-dht6[=true|false] Enable IPv6 DHT functionality. Use --dht-listen-port option to specify port number to listen on. See also --dht-listen-addr6 option. Possible Values: true, false Default: false Tags: #basic, #bittorrent --dht-listen-addr6=ADDR Specify address to bind socket for IPv6 DHT. It should be a global unicast IPv6 address of the host. Tags: #basic, #bittorrent -M, --metalink-file=METALINK_FILE The file path to the .meta4 and .metalink file. Reads input from stdin when '-' is specified. Possible Values: /path/to/file, - Tags: #basic, #metalink URI, MAGNET, TORRENT_FILE, METALINK_FILE: You can specify multiple HTTP(S)/FTP URIs. Unless you specify -Z option, all URIs must point to the same file or downloading will fail. You can also specify arbitrary number of BitTorrent Magnet URIs, torrent/ metalink files stored in a local drive. Please note that they are always treated as a separate download. You can specify both torrent file with -T option and URIs. By doing this, download a file from both torrent swarm and HTTP/FTP server at the same time, while the data from HTTP/FTP are uploaded to the torrent swarm. For single file torrents, URI can be a complete URI pointing to the resource or if URI ends with '/', 'name' in torrent file is added. For multi-file torrents, 'name' and 'path' in torrent are added to form a URI for each file. Make sure that URI is quoted with single(') or double(") quotation if it contains "&" or any characters that have special meaning in shell. About the number of connections Since 1.10.0 release, aria2 uses 1 connection per host by default and has 20MiB segment size restriction. So whatever value you specify using -s option, it uses 1 connection per host. To make it behave like 1.9.x, use --max-connection-per-server=4 --min-split-size=1M. Refer to man page for more information.