iOS – How to Remove Annoying Screenshot Pop-Up

You can change 'Screen shot' to 'screenshot' with the following commands

defaults write com.apple.screencapture name screenshot
killall SystemUIServer

If you want to go digging a bit deeper in Terminal, you can achieve what you want by doing the following:

NOTE: Make a backup of any files you change in case you make a mistake.

1. cd /System/Library/CoreServices/SystemUIServer.app/Contents/Resources/English.lproj
2. Make a copy of the existing file:
   sudo cp ScreenCapture.strings ScreenCapture.strings.old
3. Enter Admin password if prompted
4. Convert to an editable format:
   sudo plutil -convert xml1 ScreenCapture.strings

5. sudo vi ScreenCapture.strings

   Locate the following lines:

   <key>%@ %@ at %@</key>  
   <string>%@ %@ at %@</string>  
   

   and replace with the following lines:

   <key>%@ %@ at %@</key>  
   <string>%@_%@_%@</string>  
   

6. Convert back to binary:
   sudo plutil -convert binary1 ScreenCapture.strings
7. killall SystemUIServer

which combined with the first change should get you something like this:

screenshot_2011-08-30_10.01.36.png which is very close to what you need I think

Webshot Free can do this (there's a 99¢ ad-free version too). It's supposed to let you just change http:// to webshot:// and it will open the same URL in in the app. That didn't work, but cut+paste did.

There may be other apps which are better for certain needs, depending on what you want to actually do with the page. If you just want a JPG or PNG of it, Webshot Free works fine.

If you are trying to save a page for reading later, iCab Mobile ($2, universal) will let you save a .webarchive or a .pdf file. [Note: the print to pdf function is actually provided by 3rd party webapps, but it's integrated into iCab].

There are a variety of "Print to PDF" apps in the app store, PrintBureau, seems to be one of the better ones (and is universal).