If you like this idea and are stuck in Windows, this does the same thing:

    @set @jScript=1;/*
    @for /f "tokens=1,2" %%w in ('mode con:') do @if "%%w" == "Columns:" set cols=%%x
    @cscript /noLogo /E:jScript  "%~f0" %cols% %1 =
    @Goto :EOF
    */line='';while(line.length<WScript.Arguments(0))line+=WScript.Arguments(1);
    WScript.StdOut.Write(line.substr(0,WScript.Arguments(0)));

Save as hr.cmd and stick it somewhere in your path.