An Applescript to resize windows from the command line

resize.scpt

on run argv
-- Variables
set _cmd to (item 1 of argv)
tell application "Finder" to set _bounds to bounds of window of desktop
set _xPos to (item 1 of _bounds)
set _yPos to (item 2 of _bounds)
set _ySize to (item 3 of _bounds)
set _xSize to (item 4 of _bounds)
-- get bounds
-- do split: app1, app2, set split

if (_cmd = "split") then
  set _app1 to (item 2 of argv)
  set _app2 to (item 3 of argv)
  set _splitPerc to ((item 4 of argv)/100)
  set _splitPoint to (_ySize*_splitPerc)

tell application "System Events" to tell process _app1
    set position of front window to {_xPos, _yPos}
    set size of front window to {_splitPoint, _xSize}
  end tell

  tell application "System Events" to tell process _app2
    set position of front window to {_splitPoint, _yPos}
    set size of front window to {_ySize-_splitPoint, _xSize}
  end tell

if (_splitPerc >= 0.5) then
  --your code
  tell application _app2 to activate
  tell application _app1 to activate
else
  --your code
  tell application _app1 to activate
  tell application _app2 to activate
end if

end if
	
end run

Example usage from the command line:
osascript resize.scpt split "Brave Browser" "Obsidian" 70

• osascript resize.scpt – Run the script as an Applescript
• split – Command function (I might add more in the future)
• "Brave Browser" – Application to place on the left side
• "Obsidian" – Application to place on the right side
• 70 – Percentage of the application on the right

Result: Brave Browser gets fills the left 70% of the screen, Obsidian the right 30%.

I like to use this with Bunch App for window placement.