"$d_SysMaint""Linux/curl - [exist, [up, down]load] [files, url] notes.txt"
www.BillHowell.ca  02Oct2020 initial based on forgotten scripts somewhere


08******08
download IJCNN2021 video : 
$ curl -o  '/media/bill/VIDEOS/Neural Net videos/2021 IJCNN Shenzen, China online/262.mp4'   'https://confcats-event-sessions.s3.amazonaws.com/ijcnn21/videos/262.mp4'  
>> NYET!  use wget
https://www.howtogeek.com/447033/how-to-use-curl-to-download-files-from-the-linux-command-line/


08******08
?date?
curl -> you must be connected to the internet!!! 
https://www.shellhacks.com/check-website-availability-linux-command-line/
Check a Website Availability from the Linux Command Line
Posted on Tuesday December 27th, 2016 by admin 
Check a website availability with CURL

Execute the following command to check whether a web site is up, and what status message the web server is showing:
	$ curl -Is http://www.shellhacks.com | head -1
	HTTP/1.1 200 OK
Status code ‘200 OK’ means that the request has succeeded and a website is reachable.
Here is an another example that shows you how curl displays different status codes.
	$ curl -Is http://shellhacks.com | head -n 1
	HTTP/1.1 301 Moved Permanently

+-----+
man curl
       -I, --head
              (HTTP FTP FILE) Fetch the headers only! HTTP-servers feature the command HEAD which this uses to  get
              nothing  but  the header of a document. When used on an FTP or FILE file, curl displays the file size
              and last modification time only.
       -s, --silent
              Silent or quiet mode. Don't show progress meter or error messages.  Makes Curl mute.  It  will  still
              output the data you ask for, potentially even to the terminal/stdout unless you redirect it.


08********08
02Oct2020

$ find  "/media/bill/PROJECTS/Qnial/MY_NDFS/"  -maxdepth 1  -type f  -name "*.ndf"  |   tr  \\n  \\0  |  xargs -0  -IFILE  grep  --with-filename  --line-number  "curl" "FILE"  
/media/bill/PROJECTS/Qnial/MY_NDFS/file_ops.ndf:480:	host  link  'curl --output  "'  pname  '"  "'  URLname  '" '  ;  


$ find  "/media/bill/PROJECTS/bin/"  -maxdepth 1  -type f  -name "*.sh"  |   tr  \\n  \\0  |  xargs -0  -IFILE  grep  --with-filename  --line-number  "curl" "FILE"  
/media/bill/PROJECTS/bin/cloud work file.sh:26:curl  "$url$fname"  -o "$d_cloud$fname"  
/media/bill/PROJECTS/bin/cloud work file.sh:40:curl  -T  "$d_cloud$fname"  "$url$fname"  

$ curl -Is "http://www.BillHowell.ca/index.html" 
HTTP/1.1 200 OK
Date: Fri, 02 Oct 2020 18:03:28 GMT
Server: Apache
Last-Modified: Tue, 22 Sep 2020 23:30:33 GMT
ETag: "2198-5afef5a79a1bb"
Accept-Ranges: bytes
Content-Length: 8600
Vary: Accept-Encoding,User-Agent
Content-Type: text/html; charset=utf-8

$ curl -Is "http://www.BillHowell.ca/index.html"  |  head -1
HTTP/1.1 200 OK

QNial : 
qnial> host_result  'curl -Is "http://www.BillHowell.ca/index.html"  |  head -1'
+---------------+
|HTTP/1.1 200 OK|
+---------------+



# enddoc