Memory fault(coredump)

I think I am going to mention 3 issues here

Server underwent a planned reboot on 21 Apr

crontab -l has this

0 0 * * 0,3                     /var/opt/ignite/create_recovery_image.sh

This script failed on Apr 22. It didnt get triggerred.

To investigate the reason - I was browsing this 11.23 HPUX server and then I was trying to see /var/mail/root

I want to see what happened on 22 Apr

# ls -lrt /var/mail/root
-rw-rw---- 1 root mail 89551281 Apr 23 19:00 /var/mail/root
#

As you can see it is a large file.

I was not sure how to grep for that 22 Apr date

I didnt want to do this but I did a vi /var/mail/root

server was knackered I felt for a second. I pressed ctrl C

I get this message "

Memory fault(coredump)

and then I got the prompt back

Server is alright

1. why did the script fail

2. how do I grep for an event in a very large file (not very important for me at the moment)

3. should I worry about memory fault (core dump)

Many thanks