Basic Usage
Download a file
aria2c http://host/image.isoNote: As of 1.10.0, aria2 uses 1 connection per host in each download. You can change this using --max-connection-per-server or its short form -x option.
To download a file using 2 connections from single host:
aria2c -x2 http://host/image.isoNote: To stop a download, press Ctrl-C. You can resume the transfer by running aria2c with the same arguments at the same directory. You can change URIs as long as they are pointing to the same file.
Download a file using 2 connections
aria2c -s2 http://host/image.iso http://mirror1/image.iso http://mirror2/image.isoNote: If you specify URIs more than the value of -s option, for this example, 2, first 2 URIs are used and 3rd URI is used for backup, which means if one of first 2 URIs are failed then 3rd is kicked in.
Download a file from HTTP and FTP servers
aria2c http://host1/file.zip ftp://host2/file.zip
Parallel downloads of arbitrary number of URI, metalink, torrent
aria2c -Z http://host/file1 file2.torrent file3.metalinkNote: If you specify only torrent or metalink file stored in your local disk, then -Z option is not required. So you can do:
aria2c file1.torrent file2.torrent
Download files listed in a file concurrently
aria2c -ifiles.txt -j5Note: -j option specifies the number of concurrent downloads. You can include local torrent and metalink files in a list file.
Note: You can specify several options in the input file. See Input File section.
Save error/unfinished downloads on exit
aria2c -ifiles.txt --save-session=out.txtWhen you press Ctrl-C or aria2 exits, all error/unfinished downloads are saved in out.txt. Note that downloads added by aria2.addTorrent and aria2.addMetalink XML-RPC method are not saved. You can use this file as an input file to restart downloads:
aria2c -iout.txt
Metalink Download
Download files with remote metalink
aria2c http://host/file.metalink
Download files with remote Metalink; metalink file itself is processed in memory
aria2c --follow-metalink=mem http://host/file.metalink
Download using a local metalink file
aria2c -t10 --lowest-speed-limit=4000 file.metalinkNote: To stop a download, press Ctrl-C. You can resume the transfer by running aria2c with the same arguments at the same directory.
Download file using 5 servers
aria2c -C5 file.metalinkNote: With metalink file, -s option has no effect. Use -C option instead.
Download several local metalink files
aria2c file1.metalink file2.metalink
Print the contents of the metalink file
aria2c -S file.metalink
Download only selected files using index
aria2c --select-file=1-4,8 -Mfile.metalinkNote: The index is printed to the console using -S option.
Download a file using a local metalink file with user preference
aria2c --metalink-location=JP,US --metalink-version=1.1 --metalink-language=en-US file.metalink
BitTorrent Download
Download files from remote BitTorrent file
aria2c http://site/file.torrent
Download files from remote BitTorrent file; torrent file itself is processed in memory
aria2c --follow-torrent=mem http://site/file.torrent
Download using a local torrent file
aria2c -u40K /path/to/file.torrentNote: -u, --max-upload-limit specifies the max upload rate.
Note: To stop a download, press Ctrl-C. You can resume the transfer by running aria2c with the same arguments at the same directory.
You can download multiple torrents.
aria2c /path/to/file1.torrent /path/to/file2.torrent
Download using BitTorrent Magnet URI
aria2c "magnet:?xt=urn:btih:248D0A1CD08284299DE78D5C1ED359BB46717D8C&dn=aria2"NOTE: Don't forget to quote BitTorrent Magnet URI which includes "&" character with single(') or double(") quotation. It is strongly recommended to enable DHT when you use Magnet URI. See --enable-dht option.
Save metadata as .torrent file
aria2c --bt-save-metadata "magnet:?xt=urn:btih:248D0A1CD08284299DE78D5C1ED359BB46717D8C&dn=aria2"The above command will save metadata as a torrent file named as "248d0a1cd08284299de78d5c1ed359bb46717d8c.torrent"
Adjust the number of peers adaptively
If the whole download speed of every torrent is lower than 200K, aria2 temporarily increases the number of peers to try for more download speed.aria2c --bt-request-peer-speed-limit=200K file.torrentNote: Configuring --bt-request-peer-speed-limit option with your preferred download speed can increase your download speed in some cases.
Enable DHT
aria2c --enable-dht http://site/file.torrentNote: Since 1.7.2, DHT is enabled by default. DHT doesn't start while aria2 only handles HTTP/FTP downloads. On the first torrent download begins, aria2 initiates DHT functionality. After that, DHT runs until aria2 exits. Prior 1.7.2, DHT is disabled by default.
Enable IPv6 DHT
aria2c --enable-dht6 --dht-listen-port=6881 --dht-listen-addr6=YOUR_GLOBAL_UNICAST_IPV6_ADDR --enable-async-dns6Note: If aria2c is not built with c-ares, --enable-async-dns6 is unnecessary. aria2 shares same port between IPv4 and IPv6 DHT.
Add and remove tracker URI
The following example instructs aria2 to removes all tracker announce URIs described in file.torrent and use "http://tracker1/announce" and "http://tracker2/announce" instead.aria2c --bt-exclude-tracker="*" --bt-tracker="http://tracker1/announce,http://tracker2/announce" file.torrent
Encryption
By default, aria2 accepts both encrypted/unencrypted connections and it first tries encryption(obfuscation) handshake and if it fails then falls back to legacy BitTorrent handshake.To instruct aria2 to only accept and establish connection with encryption handshake,
aria2c --bt-require-crypto=true http://site/file.torrentThere are 2 types of encryption: header only or full connection. By default, if both types of encryption are provided by peer, aria2 chooses header only encryption. To instruct aria2 to always use full connection encryption,
aria2c --bt-min-crypto-level=arc4 http://site/file.torrent
Print the contents of the torrent file:
aria2c -S file.torrent
Download only selected files using index (usually called "selectable download")
aria2c --select-file=1-4,8 -Tfile.torrentNote: The index is printed to the console using -S option.
Change the listening port for incoming peer
aria2c --listen-port=6881-6883 file.torrentNote: Make sure that the specified ports are open for incoming/outgoing TCP traffic.
Specify the condition to stop program after torrent download finished
aria2c --seed-time=120 --seed-ratio=1.0 file.torrentNote: In the above example, the program exists when the 120 minutes has elapsed since download completed or seed ratio reaches 1.0.
Throttle upload speed
aria2c --max-upload-limit=100K file.torrent
Seeding already downloaded file
You can seed downloaded file using -V option. This will first check piece hashes for the downloaded file.aria2c -V -d/path/to/dir file.torrentIf you are sure the file is correct, then use --bt-seed-unverified option to skip hash check before seeding.
aria2c --bt-seed-unverified -d/path/to/dir file.torrentYou can seed multiple torrents.
aria2c --bt-seed-unverified -d/path/to/dir file1.torrent file2.torrent
Specify file name with index
To specify output filename for BitTorrent downloads, you need to know the index of file in torrent file using -S option. For example, the output of -S option looks like this:idx|path/length ===+====================== 1|dist/base-2.6.18.iso |99.9MiB ---+---------------------- 2|dist/driver-2.6.18.iso |169.0MiB ---+----------------------To save dist/base-2.6.18.iso in /tmp/mydir/base.iso and dist/driver-2.6.18.iso in /tmp/dir/driver.iso, use the following command:
aria2c --dir=/tmp --index-out=1=mydir/base.iso --index-out=2=dir/driver.iso file.torrentNote: The --index-out option with http URI to torrent file doesn't work. It only works with local torrent files. aria2 doesn't remember the file path specified in --index-out option. You have to specify --index-out option every time for resuming or seeding. aria2 doesn't warn you if you forget this option, so be careful.
Prioritize piece for previewing files
Download first 1MiB of each file in a torrent with high priority.aria2c --bt-prioritize-piece=head file.torrent
Use With Proxy
Set proxy server to use all protocols(HTTP(S)/FTP)
aria2c --all-proxy='http://proxy:8080' http://host/fileNote: --all-proxy option can be overrode by protocol specific proxy options: --http-proxy, --https-proxy and --ftp-proxy.
Set proxy server to be in HTTP only
aria2c --http-proxy='http://proxy:8080' http://host/file
Use proxy that requires authentication
aria2c --http-proxy='http://proxy:8080' --http-proxy-user='username' --http-proxy-passwd='password' http://host/file
aria2c --http-proxy='http://username:password@proxy:8080' http://host/fileNote: username and password should be percent-encoded. For example, if username is 'myid@domain', then percent-encoded form is 'myid%40domain'.
Advanced HTTP Features
Load cookies
Load Mozilla/Firefox(1.x/2.x) and Netscape format:aria2c --load-cookies=cookies.txt http://host/fileLoad Firefox3 format:
aria2c --load-cookies=cookies.sqlite http://host/fileNote: You can use Firefox/Mozilla's cookie file without modification.
Resume download started by web browsers or another programs
aria2c -c -s2 http://host/partiallydownloadedfile.zip
Other Advanced Features
Throttle download speed
aria2c --max-download-limit=100K http://host/file
Repair a damaged download using -V option
aria2c -V file.metalinkNote: This option is only available used with BitTorrent? or metalink with chunk checksums.
Drop connection if download speed is lower than specified value
aria2c --lowest-speed-limit=10K file.metalink
Parameterized URI support
You can specify set of parts:aria2c -P http://{host1,host2,host3}/file.iso
You can specify numeric sequence using []:
aria2c -Z -P http://host/image[000-100].pngNote: -Z option is required if the all URIs don't point to the same file, such as the above example.
You can specify step counter:
aria2c -Z -P http://host/image[A-Z:2].png
Time-stamping
aria2 gets timestamp of a file from the remote server and apply it to the local file.aria2c -R http://host/file.iso
Execute command when download finishes
aria2c --on-download-complete=COMMAND http://example.org/file.isoSee also --on-download-error, --on-download-start and --on-download-stop option, or run "aria2c -h#hook".
Writing to /dev/null
aria2c -d /dev -o null --allow-overwrite=true http://example.org/file--allow-overwrite=true is needed to prevent aria2 from renaming existing /dev/null.
Input File
The input file can contain list of URIs to feed them into aria2. You can specify multiple URIs for a single entity: separate URIs on a single line using the TAB character.Each line is treated as if it is provided in command-line argument. Therefore they are affected by -Z and -P options.
Additionally, options can be specified after each line of URIs. See Input File section in aria2c man page for complete list of available options. These options have exactly same meaning of the ones in the command-line options, but it just applies to the URIs it belongs to.
For example, let the content of uri.txt be:
http://server/file.iso http://mirror/file.iso dir=/iso_images out=file.img http://foo/barIf aria2 is executed with -i uri.txt -d /tmp options, then file.iso is saved as /iso_images/file.img and it is downloaded from http://server/file.iso and http://mirror/file.iso. The file bar is downloaded from http://foo/bar and saved as /tmp/bar.
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