An application — iA Writer — somehow got stuck off screen with only the corner showing. I can't grab it or use other means to move it from that position.
All new windows open in that position, regardless of if I open/close the application.
Is there a terminal command for moving a specific window's position?
You can do it with AppleScript:
$ osascript \
-e 'tell application "Terminal"' \
-e 'set position of front window to {1, 1}' \
-e 'end tell'
This isn't guaranteed to work. It's up to the app itself whether it will obey this command. You can try something like set bounds of front window to {1, 1, 800, 600} if it refuses to move the window. That will also resize it, but that might be a good thing, depending on how screwed up the window is.
I've broken the long command up purely for readability. It's fine to give it all as a single line, without the backslashes.
And yes, you need multiple -e options. AppleScript is a line-based language, so each line has to be given separately. You could run osascript without arguments and type the three lines by hand at it instead, if you prefer.
