WGET and CURL

目錄

• WGET and CURL
  • 對比
  • wget
  • curl
    • curl使用示例

WGET and CURL

對比

CURL 和WGET均可以用來下載文件，用法也相似：curl/wget [-option...] [url..]
但二者仍是有區別的
|對比||
|--|--|
|curl| 1. curl是LInux下的數據傳輸工具，能夠經過URL想服務器上傳數據，或者從服務器下載數據。curl支持HTTP、FTP、SMTP、RSTP等應用層協議。 2. curl參數更多更復雜，須要依賴libcurl庫，能夠把 cURL 想象成一個精簡的命令行網頁瀏覽器。它支持幾乎你能想到的全部協議，能夠交互訪問幾乎全部在線內容。惟一和瀏覽器不一樣的是，cURL 不會渲染接收到的相應信息
|wget |wget是Linux系統中的文件下載命令， 支持HTTP、FTP等協議。 wget是非交互性的，且具備自動下載功能， 能本身在後臺工做。 也就是說在用戶logout以後，wget仍然可以繼續完成本身的工做。 wget更簡單，不依賴其餘的庫，且沒有那麼多的複雜參數|

wget

參數	解釋
-d：	調試模式 -d參數可以打印出wget運行時的調試信息：如HTTP報文頭等。這個參數很是有用。
-O：	指定本地文件名 wget www.sina.com -O sina.html表示將www.sina.com 的內容下載到sina.html。
-b：	後臺運行 wget運行在後臺，用戶logout以後仍能繼續下載

curl

參數	用法	詳解
-o	傳輸到指定文件，也就是要指定文件名	eg：curl -o baidu_index.html www.baidu.com能夠將百度首頁的html源碼保存到baidu_index.html文件中
-O	使用url默認文件名傳輸	eg：curl -O http://img.wallpapersking.com/800/2012-8/20120812103710.jpg 直接將圖片保存到本地文件20120812103710.jpg
-A	--user-agent	設置用戶代理髮送給服務器
-b	--cookie <name=string/file>	cookie字符串或文件讀取位置
-c小寫c	--cookie-jar	操做結束後把cookie寫入到這個文件中
-C大寫C	--continue-at	斷點續轉
-D	--dump-header	把header信息寫入到該文件中
-e	--referer	來源網址
-f	--fail	鏈接失敗時不顯示http錯誤
-o	--output	把輸出寫到該文件中
-O	--remote-name	把輸出寫到該文件中，保留遠程文件的文件名
-r	--range	檢索來自HTTP/1.1或FTP服務器字節範圍
-s	--silent	靜音模式。不輸出任何東西
-T	--upload-file	上傳文件
-u	--user <user[:password]>	設置服務器的用戶和密碼
-w	--write-out [format]	什麼輸出完成後
-x	--proxy <host[:port]>	在給定的端口上使用HTTP代理
-#	--progress-bar	進度條顯示當前的傳送狀態

curl使用示例

下載docker compose包到指定文件
curl -L https://github.com/docker/compose/releases/download/1.24.0-rc1/docker-compose-Linux-x86_64> /usr/local/bin/docker-compose
|用法|命令|解釋|
|--|--|--|
|下載頁面： |curl -o index.html http://url.com |
|下載文件並顯示簡單進度條：|curl -# -o centos6.8.iso http://mirrors.aliyun.com/centos/6.8/isos/x86_64/CentOS-6.8-x86_64-minimal.iso |
|斷點續傳： |curl -# -o centos6.8.iso -C - http://mirrors.aliyun.com/centos/6.8/isos/x86_64/CentOS-6.8-x86_64-minimal.iso |
|僞造來源頁面： |curl -e http://url.com http://B.com | #告訴B目標網站，我是從地址url來的
|僞造代理設備： |curl -url " Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" http://B.com | 告訴B目標網站，我是GOOGLE爬蟲蜘蛛" Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"固然其實換成"Mozilla/5.0 AppleWebKit/600 Mobile MicroMessenger/6.0"就是微信內置瀏覽器
|查看本站的http頭： |curl -I http://url.com |輸出內容通常爲：HTTP/1.1 200 OK；Date: Fri, 25 Nov 2016 16:45:49 GMT；Server: Apache；Set-Cookie: rox__Session=abdrt8vesprhnpc3f63p1df7j4; path=/；...
|設置http請求頭： |curl -H "Cache-Control:no-cache" http://url.com |
|發送表單數據： |curl -F "pic=@logo.png" -F "site=aiezu" http://url.com/ |
|發送cookie： |curl -b "domain=url.com" http://url.com

curl退出碼

退出碼	錯誤描述
1	Unsupported protocol. This build of curl has no support for this protocol.
2	Failed to initialize.
3	URL malformed. The syntax was not correct.
5	Couldn't resolve proxy. The given proxy host could not be resolved.
6	Couldn't resolve host. The given remote host was not resolved.
7	Failed to connect to host.
8	FTP weird server reply. The server sent data curl couldn't parse.
9	FTP access denied. The server denied login or denied access to the particular resource or directory you wanted to reach. Most often you tried to change to a directory that doesn't exist on the server.
11	FTP weird PASS reply. Curl couldn't parse the reply sent to the PASS request.
13	FTP weird PASV reply, Curl couldn't parse the reply sent to the PASV request.
14	FTP weird 227 format. Curl couldn't parse the 227-line the server sent.
15	FTP can't get host. Couldn't resolve the host IP we got in the 227-line.
17	FTP couldn't set binary. Couldn't change transfer method to binary.
18	Partial file. Only a part of the file was transferred.
19	FTP couldn't download/access the given file, the RETR (or similar) command failed.
21	FTP quote error. A quote command returned error from the server.
22	HTTP page not retrieved. The requested url was not found or returned another error with the HTTP error code being 400 or above. This return code only appears if -f/--fail is used.
23	Write error. Curl couldn't write data to a local filesystem or similar.
25	FTP couldn't STOR file. The server denied the STOR operation, used for FTP uploading.
26	Read error. Various reading problems.
27	Out of memory. A memory allocation request failed.
28	Operation timeout. The specified time-out period was reached according to the conditions.
30	FTP PORT failed. The PORT command failed. Not all FTP servers support the PORT command, try doing a transfer using PASV instead!
31	FTP couldn't use REST. The REST command failed. This command is used for resumed FTP transfers.
33	HTTP range error. The range "command" didn't work.
34	HTTP post error. Internal post-request generation error.
35	SSL connect error. The SSL handshaking failed.
36	FTP bad download resume. Couldn't continue an earlier aborted download.
37	FILE couldn't read file. Failed to open the file. Permissions?
38	LDAP cannot bind. LDAP bind operation failed.
39	LDAP search failed.
41	Function not found. A required LDAP function was not found.
42	Aborted by callback. An application told curl to abort the operation.
43	Internal error. A function was called with a bad parameter.
45	Interface error. A specified outgoing interface could not be used.
47	Too many redirects. When following redirects, curl hit the maximum amount.
48	Unknown TELNET option specified.
49	Malformed telnet option.
51	The peer's SSL certificate or SSH MD5 fingerprint was not ok.
52	The server didn't reply anything, which here is considered an error.
53	SSL crypto engine not found.
54	Cannot set SSL crypto engine as default.
55	Failed sending network data.
56	Failure in receiving network data.
58	Problem with the local certificate.
59	Couldn't use specified SSL cipher.
60	Peer certificate cannot be authenticated with known CA certificates.
61	Unrecognized transfer encoding.
62	Invalid LDAP URL.
63	Maximum file size exceeded.
64	Requested FTP SSL level failed.
65	Sending the data requires a rewind that failed.
66	Failed to initialize SSL Engine.
67	The user name, password, or similar was not accepted and curl failed to log in.
68	File not found on TFTP server.
69	Permission problem on TFTP server.
70	Out of disk space on TFTP server.
71	Illegal TFTP operation.
72	Unknown TFTP transfer ID.
73	File already exists (TFTP).
74	No such user (TFTP).
75	Character conversion failed.
76	Character conversion functions required.
77	Problem with reading the SSL CA cert (path? access rights?).
78	The resource referenced in the URL does not exist.
79	An unspecified error occurred during the SSH session.
80	Failed to shut down the SSL connection.
82	Could not load CRL file, missing or wrong format (added in 7.19.0).
83	Issuer check failed (added in 7.19.0).
XX	More error codes will appear here in future releases. The existing ones are meant to never change.

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