In order to accomplish what you want, I see not other way than both servers trusting each other bidirectionally, i.e., you will need to be able to copy files from one to the other and execute commands via ssh from one to the other. This is necessary because you will have to do a remote command execution to create marker files as Dennis said.
you are on serverB:
touch /var/tmp/4hours_marker
...wait 4 hours or a little less
you are on serverA:
OKflag=0
ran=$RANDOM
TMPDIR=/tmp/tempfile.${ran}
mkdir $TMPDIR
ssh serverB "find /my/directory/path -newer /var/tmp/4hours_marker > /tmp/filelist; touch /var/tmp/4hours_marker"
ssh serverB "scp `cat /tmp/filelist` serverA:/$TMPDIR"
cd /my/directory/path
for file in `ls -1`
do
if [ -a Ora_${file} ]
then
#file exists, compare it to the local file
diff /my/directory/path/${file} $TMPDIR/Ora_${file} > /dev/null
rr=${?}
if [ $rr -ne 0 ]
then
echo "Do something: $file is different on server B"
OKflag=2
fi
else
echo "${file} is missing on serverB. Do something"
OKflag=1
fi
diff /my/directory/path/${file} $TMPDIR/Ora_${file} > /dev/null
rr=${?}
if [ $rr -ne 0 ]
then
echo "Do something: $file is different on server B"
OKflag=2
fi
done
if [ $OKflag -eq 0 ]
then
echo "Everything checked out fine at `date`"
fi
rm -r $TMPDIR
I know there are holes in this procedure, most important of which is lack of extensive error checking but nature of this forums is to guide you down the path. I hope my script helps you wind the way, on which you can build your own script with all the error handling and else.
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UNIX because I majored in cryptology...
