Open an Application from the command line

If you regularly use the command line and want to directly open an application and pass a file to it you can use the following:

open -a TextEdit ~/Documents/myfile.txt

The switch -a says use this application:

More switches from the command line:

open --help 
-a Opens with the specified application.
-b Opens with the specified application bundle identifier. 
-e Opens with TextEdit.
-t Opens with default text editor.
-f Reads input from standard input and opens with TextEdit.
-F --fresh Launches the app fresh, that is, without restoring windows. Saved persistent state is lost, excluding Untitled documents.
-R, --reveal Selects in the Finder instead of opening.
-W, --wait-apps Blocks until the used applications are closed (even if they were already running).
-n, --new Open a new instance of the application even if one is already running.
-j, --hide Launches the app hidden.
-g, --background Does not bring the application to the foreground.
-h, --header Searches header file locations for headers matching the given filenames, and opens them.
--args All remaining arguments are passed in argv to the application's main() function instead of opened.