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This script was posted here some time ago, and I modified it slightly.
#!/usr/bin/ksh
date '+%m %d %Y' |
{
read MONTH DAY YEAR
DAY=`expr "$DAY" - 1`
case "$DAY" in
0)
...

This code was posted here by someone else to determine yesterday:
#!/usr/bin/ksh
date '+%m %d %Y' |
{
read MONTH DAY YEAR
DAY=`expr "$DAY" - 1`
case "$DAY" in
0)
...

uname -a should return info about the OS.
dmesg gives some cryptic hardware info on Solaris