Output is day.month.year (e.g. 31.12.2006):

perl -le '($D,$M,$Y)=(localtime(time-86400))[3,4,5];printf("%.2d.%.2d.%.4d",$D,++$M,$Y+=1900)'

Example for month/day/year (e.g.: 12/31/2006):

perl -le '($D,$M,$Y)=(localtime(time-86400))[3,4,5];printf("%.2d/%.2d/%.4d",++$M,$D,$Y+=1900)'

Example for year/month/day/ (e.g.: 2007/12/31):

perl -le '($D,$M,$Y)=(localtime(time-86400))[3,4,5];printf("%.4d/%.2d/%.2d",$Y+=1900,++$M,$D)'