sysecho
format:            #sysecho {string} {>}   {filename}
                     #sysecho {string} {>>} {filename}
This is a handy port for #system echo string > filename.
It was not nice to use #system echo under Windows version; for portability
of your scripts and speed, it is recommended that you use #sysecho instead
of #sys echo.
#sysecho has another feature: if the filename contains directory info, it will
try to create the last layer of directory for you.