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I'm using the wget program, but I want it not to save the html file I'm downloading. I want it to be discarded after it is received. How do I do that?

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I'm new to Linux - Would the /dev/null thing work? –  Ram Rachum Oct 10 '09 at 2:23
2  
So what's the point to download it then? –  Anonymous Dec 7 '09 at 14:59
    
@Anonymous I assume to stress the remote server.. If you don't care about the content.. I'd probably use apachebench (ab) though. –  Tom O'Connor Dec 6 '10 at 12:52

8 Answers 8

up vote 48 down vote accepted

You can redirect the output of wget to /dev/null (or NUL on Windows):

wget http://www.example.com -O /dev/null

The file won't be written to disk, but it will be downloaded.

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This doesn't save the page, but it send email to me. Also is it possible to disable emailing ? –  trante Sep 7 '13 at 6:03

If you don't want to save the file, and you have accepted the solution of downloading the page in /dev/null, I suppose you are using wget not to get and parse the page contents.

If your real need is to trigger some remote action, check that the page exists and so on I think it would be better to avoid downloading the html body page at all.

Play with wget options in order to retrieve only what you really need, i.e. http headers, request status, etc.

  • assuming you need to check the page is ok (ie, the status returned is 200) you can do the following:

    wget --no-cache --spider http://your.server.tld/your/page.html
    
  • if you want to parse server returned headers do the following:

    wget --no-cache -S http://your.server.tld/your/page.html
    

See the wget man page for further options to play with.
See lynx too, as an alternative to wget.

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I'm confused. --no-cache in the man page says it causes wget to "send the remote server an appropriate directive (‘Pragma: no-cache’) to get the file from the remote service" –  Gaia Jan 20 '13 at 19:05
    
It says to the server your client don't want a cached version of the file .. we want to get the very last release of the resource we are requesting for –  AlberT Jan 21 '13 at 15:55

If you need to crawl a website using wget and want to minimize disk churn...

For a *NIX box and using wget, I suggest skipping writing to a file . I noticed on my Ubuntu 10.04 box that wget -O /dev/null caused wget to abort downloads after the first download.
I also noticed that wget -O real-file causes wget to forget the actual links on the page. It insists on an index.html to be present on each page. Such pages may not always be present and wget will not remember links it has seen previously.

For crawling without writing to disk, the best I came up with is the following

 mkdir /dev/shm/1   
 cd /dev/shm/1
 wget --recursive --relative --no-parent ...

Notice there is no -O file option. wget will write to the $PWD directory. In this case that is a RAM-only tmpfs file system. Writing here should bypass disk churn (depending upon swap space) AND keep track of all links. This should crawl the entire website successfully.

Afterward, of course,

 rm --recursive --force *
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In case you also want to print in the console the result you can do:

wget -qO- http://www.example.com
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Another alternative is to use a tool like curl, which by default outputs the remote content to stdout instead of saving it to a file.

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Use the --delete-after option, which deletes the file after it is downloaded.

Edit: Oops, I just noticed that has already been answered.

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Check out the "-spider" option. I use it to make sure my web sites are up and send me an email if they're not. This is a typical entry from my crontab:

46 */2 * * * if ! wget -q --spider http://www.rochesterflyingclub.com/ >/dev/null 2>&1; then echo "Rochester Flying Club site is down" ; fi
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$ wget http://www.somewebsite.com -O foo.html --delete-after

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