SOLVED
Syntactically, the only major problem with this script is a missing "#" symbol at the start of the first line - cut and paste the following and it should run fine. Oh and also those values will be in KB, not Bytes
#!/bin/sh
echo " "
print " We are going to calculate the physical memory and the available memory in this HPUX System."
typeset -i mem=$(grep Physical /var/adm/syslog/syslog.log | awk '{print $7}')
print $(hostname) has $mem KB memory .+- $(( $mem /1024 )) MB
echo " "
print " This is the available memory ."
typeset -i mem1=$(grep Physical /var/adm/syslog/syslog.log | awk '{print $13}')
print $(hostname) has $mem1 KB of available memory .+- $(( $mem1 /1024 )) MB
echo " "
Of course that doesn't mean this is a good script! As a method for determining the amount of memory on a system just looking in syslog.log is not by any means reliable, as this log can be rotated or truncated meaning the information from boot time is no longer available.
And of course the value you calculate for "available memory" is meaningless, as it just tells you how much memory was available when the system booted, not how much is available (presumably you want to know "free" memory?) when the script is run. A quick and dirty, but more reliable script might be something like this:
#!/bin/sh
echo " "
print " We are going to calculate the physical memory and the available memory in this HPUX System."
mem=$(machinfo | grep ^Memory: | awk '{ print $2 }')
print $(hostname) $mem MB Physical Memory
echo " "
print " This is the available (free) memory ."
typeset -i free_pages=$(vmstat | tail -1 | awk '{ print $5 }')
typeset -i page_size=$(kctune -P current base_pagesize | cut -f 2)
(( mem1 = ${free_pages} * ${page_size} ))
print $(hostname) has $mem1 bytes of available memory .+- $(( $mem1 /1024 )) mb
echo " "
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