media share set to webroot after 4.2.19 upgrade

Hi! Just joined forum in an effort to get my readyNAS business pro functioning well again. my compliments to super_poussin who i see designed the NAS version of PS3 Media Server. i have been struggling to deal with RAIDiater 4.2.19 and loading media server add-ons on same day. I managed to remap windows explorer to \c\media so i am now in business again. I have updated to 4.2.20-T4 but still cannot communicate to PS3 with PS3 media server. I have installed ssh and 'copy and pasted' p-s's recommended fix (by notepad) into a file which i have renamed Shares.conf-sav (I hope this is how it is done). I have got hold of putty and have made connection ok to my NAS. What command line do I need to achieve overwrite of this file? Sorry if this is silly - my first venture into linux commands.