Time for an 2014 update…

Task/File-size/Batch-File/file-size.bat

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+@echo off
+if not exist "%~1" exit /b 1 & rem If file doesn't exist exit with error code of 1.
+for /f %%i in (%~1) do echo %~zi
+pause>nul

Task/File-size/Julia/file-size.julia

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+println(filesize("input.txt"))
+println(filesize("/input.txt"))

Task/File-size/VBScript/file-size.vb

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+With CreateObject("Scripting.FileSystemObject")
+	WScript.Echo .GetFile("input.txt").Size
+	WScript.Echo .GetFile("\input.txt").Size
+End With