when you press "Shift Command 4" to copy a selected area, it saves it to a file and i would like to know hwo to change that destination to anoter file like lets say desktop. Can someone help
It should automatically save to the Desktop folder. Do you have DropBox installed, it has a setting to intercept screen shots and send them elsewhere.
Otherwise, you have to use the Terminal to set the location:
defaults write com.apple.screencapture location /path/to/folder
For instance, if you want it to be your Documents folder, it would be:
defaults write com.apple.screencapture location ~/Documents
To return to the default of the Desktop folder, just delete the location property.
defaults delete com.apple.screencapture location
There is a Terminal command to change this. You can also use an utility like OnyX if you need a GUI program to do it.
defaults write com.apple.screencapture location (path-to-folder)
how to change "save picture of selected area as a file" destination
