Ubuntu curl command

Transfer: https://www.cnblogs.com/X-knight/p/10589961.html

Summary:

　　cURL (CommandLine Uniform Resource Locator) is a file transfer tool URL syntax to work in a command line use, first published in 1997. It supports file uploads and downloads, it is a comprehensive transfer tool.

curl command a lot of parameters, just to name a part of.
-v / - v parameter verbose lowercase, for printing more information, including requests to send information, which is especially useful in debugging scripts.
-m / - max-time <seconds > maximum length specified process
 -H / - header <header> designation request header parameter
 -s / - slient information output reduction, such as the progress
 --connect-timeout <seconds> when trying to connect the specified maximum length of
 -x / - proxy <proxyhost [: port]> Specifies the proxy server address and port, the default port 1080
 -T / - the Upload-file <file> Specifies the upload file path
 -o / - output <file> output file name is
 -d / - data / - data- ascii <data> Specifies POST content
 --retry <num> specifies a retry count
 -e / - referer <URL> Specifies the reference address
 - I / - head to return only the header information using a hEAD request

1, curl installed

1	sudo apt-get install curl

2, GET requests

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curl http://www.baidu.com，回车之后，HTML内容打印在屏幕上；如果这里的URL指向的是一个文件或者一幅图都可以直接下载到本地。 curl -i "http://www.baidu.com" 显示全部信息 curl -l "http://www.baidu.com" 只显示头部信息 curl -v "http://www.baidu.com" 显示get请求全过程解析

wget "http://www.baidu.com" can

3, Download

1	curl –o linjiqin http://www.cnblogs.com/X-knight/，执行后可以看到下载进度提示，完成100%后会自动退出了，把网页保存到X-knight中。

It also has a capital O option is preserved in accordance with the file name on the server to a local, if you perform curl -O http://www.cnblogs.com , is being given, suggesting not find the file name, if replaced -O https://www.cnblogs.com/X-knight/p/10589004.html curl , automatically save the file as 10,589,004 .html.

4, upload

1	-T/--upload-file：往服务器上传文件

usage:

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上传多个文件 curl -T "img[1-1000].png" ftp://example.com/upload/   上传多个文件 curl -T "{file1,file2}" http://www.example.com

5, POST method
-d or --data parameters: post request usage of:

1	curl -d "id=1&name=test" http://example.com/example.php ，需把请求的参数和URL分开，

At the same time you can use:

1	curl -d "id=1" -d "name=test" http://example.com/example.php  ，相当于提交了两个参数。当提交的参数值中有特殊字符就需要先转义。如空格时，就需要转义成%20。

　　

--data-urlencode parameters: to escape special characters automatically, without manual prior escaped.

1	curl --data-urlencode "name=April 1" http://example.com/example.php

-F or --form: upload local files to the server, usage is:

1	curl -F "filename=@/home/test/test.pic" http://example.com/example.php 。千万不能漏掉@符号。

6, set the referer
sometimes if we direct requests a URL can not be successful, it needs to determine whether referer correctly, it can be simulated by -e parameter or --referer

1	curl --referer http://www.example.com http://www.example.com

7, designated Agent the User
-A / - the User-Agent: disguised as specified Chrome browser access, usage:

1	curl -A "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36" www.baidu.com

　　

8, forged the cookie
-b or --cookie:

There are two ways:

First, specify the parameters and values:

1	curl --cookie "name=xxx" http://www.example.com

Second, read from a file:

1	curl -b /cookie.txt http://www.example.com

9, stored cookie
-C / - JAR-cookie: cookie generated when the curl command file save operation is performed:

1	curl -c ./cookie.txt -d username=aaaa -d pwd=****** http://www.example.com

10, define the output display content
-w / - write-out: output content can be defined, such as the common code http, TCP connection time, time domain analysis, a first time the handshake time and response time, is very strong.

1, print out the http return code

1	curl -o /dev/null -s -w %{http_code} "http://www.baidu.com"

2, the response time of printing

1	curl -o /dev/null -s -w "time_total: %{time_total}\n" "http://www.baidu.com"