When I save a screenshot I want to be able to specify any name I want (and maybe destination directory). Sharpshooter for mac does this, but it's a ridiculous $15. Cheaper alternatives?
Changing the prefix part of the names
defaults write com.apple.screencapture name "My Screenshot" killall SystemUIServer
Changing the format of the names
f=/System/Library/CoreServices/SystemUIServer.app/Contents/Resources/English.lproj/ScreenCapture.strings f2=~/Desktop/ScreenCapture.strings sudo cp $f $f2 sudo chown $USER $f2 plutil -convert xml1 $f2 open $f2 -a TextEdit
<key>%@ %@ at %@</key> <string>%@ %@ at %@</string>
To something like
<key>%@ %@ at %@</key> <string>My %@ %@ at %@</string>
(The default format is currently something like
Screen Shot 2012-06-12 at 8.02.40 AM depending on the locale settings.)
sudo chown root $f2 sudo cp $f2 $f killall SystemUIServer
Changing the default location
defaults write com.apple.screencapture location ~/Pictures/ killall SystemUIServer
Using custom scripts
I've disabled the default shortcuts and have assigned shortcuts to scripts like
screencapture -i ~/Desktop/`date '+%y%m%d%H%M%S'`.png.
Skitch lets you do this, as well as online sharing, annotation, and drawing, and it's free.
A much easier way than Laurie's answer is to use a free application called Deeper. It is really easy to use. Just enter in the name of that you want in the screenshot name field (under the General tab):
Click "Apply" and you are done. A nice feature of Deeper is the ability to restore all the default settings. If you've made a change to the settings that is causing your system to act up, no problem! At the bottom of each tab is a button that says "Restore Defaults". Deeper will fix up all your settings. I highly recommend this app, as it is free and adds a great deal of customization that OS X doesn't provide.
LittleSnapper does this and more. It's $40, but worth every penny.
You can configure Better Touch Tool to open a window like the following after taking a screenshot:
where you can edit/annotate your screenshot and then save it with whatever name you like, or save it to the cloud.
It's a pay-what-you-want model (minimum $3). Best purchase I've ever made (for screenshot-ability and for many other reasons).