maim
Screenshot utility.
TLDR
Capture a screenshot and save it to the given path
$ maim [path/to/screenshot.png]
Capture a screenshot of the selected region
$ maim --select [path/to/screenshot.png]
Capture a screenshot of the selected region and save it in the clipboard (requires xclip)
$ maim --select | xclip -selection clipboard -target image/png
Capture a screenshot of the current active window (requires xdotool)
$ maim --window $(xdotool getactivewindow) [path/to/screenshot.png]