added curl turotial including basic use, useful options, and more

_commands/tools/curl.md

@@ -0,0 +1,77 @@
+---
+---
+## **curl**
+---
+---
+`curl` is a useful tool to transfer files to and from a server
+
+## Basic Use
+---
+```
+$ curl [url]
+```
+
+curl is built on libcurl and supports a ton of protocols:
+
+>DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP\
+
+<!--more-->
+
+## Useful Options
+---
+
+making a post to the server:
+
+```
+-d [content]
+```
+
+including header info (e.g., content type):
+
+```
+-i
+```
+
+saves output in file
+
+```
+-o [file]
+```
+
+downloads the file:
+
+```
+-O 
+```
+
+delete something on the server:
+
+```
+-X DELETE [file] 
+```
+
+follow a redirected URL (a URL that has moved elsewhere):
+
+```
+-L
+```
+
+## **Protection**
+---
+
+Authentication is important to prevent access to the serving using curl. curl supporls the following:
+
+
+```
+curl -u username:password ...
+```
+
+## **Play Around & Reference**
+---
+
+This turotial was written with the help of [Traversy Media's 
+"Basic cURL Tutorial"](https://www.youtube.com/watch?v=7XUibDYw4mc).
+
+This video encourages using curl and playing around with [this site](https://jsonplaceholder.typicode.com/), which is an online Rest API.
+
+## Happy curling!