Shell Programming and Scripting

exec 0</lcl/sit/apps/Tivoli/netcool/omnibus/scripts/postevent_scanner/test.dat
while read line
do
echo $line
x=1
/usr/sbin/ping $line
x=$?
if [ $x = '0' ]; then
ssh -n $line "/lcl/apps/esm/bin/postEvent.pl -s 30 -m '*** PostEvent.pl Test From Server: $line ***' -g 'INFR_Apps' -t 'None'" &
fi
done

sentra
sentra is alive
scylla
scylla is alive
[Mon Apr 27 09:25:36 2009] [INFO] Message sent to Tivoli, *** PostEvent.pl Test From Server: sentra ***

# RSYNC_OPTS :
#       May want to drop the v verbose
#       R - relative makes the source dirs under dest
#       q - quiet reduced output
#       a - archive, keeps file permissions etc
#       --delete        Deletes files on destination if removed from source
#       --numeric-ids   keeps file uids as source and doesnt match to
#                       destination users/groups with same uid
# SSH_OPTS :
#       ConnectTimeout=15
#                       Causes ssh to quit if not connected withint 15secs
#       StrictHostKeychecking=no
#                       Causes ssh to NOT ask for yes/no if the remote_server
#                       host key is unknown which causes the script to fail
#       LogLevel=quiet  Surpresses the banner information
#       -n              Prevents reading from stdin. Without this ssh overrides
#                       the current process (i.e the script) with itself.
#                       Used so ssh can run in the background
#       BatchMode=yes   Passphrase/Password querying will be disabled

# [ Binary Vars ]
#RSYNC_BIN=$(/usr/bin/which rsync)      #May want to set explicitly
RSYNC_BIN="/usr/local/bin/rsync"
#RSYNC_OPTS=" -PaRz --quiet --stats --delete --delete-excluded --copy-unsafe-links --numeric-ids"
RSYNC_OPTS=" -aRz --partial --quiet --stats --delete --delete-excluded --copy-unsafe-links --numeric-ids"
RSYNC="${RSYNC_BIN} ${RSYNC_OPTS}"      #May want to set explicitly
#SSH_BIN=$(/usr/bin/which ssh)
SSH_BIN="/usr/local/bin/ssh"
SSH_OPTS=" -i ${NOVAB_LOC_SSH_KEY} -o ConnectTimeout=15 -o BatchMode=yes -o StrictHostKeyChecking=no -o LogLevel=quiet"
SSH="${SSH_BIN} ${SSH_OPTS}"
SED=/usr/bin/sed
EGREP=/usr/bin/egrep
TEE=/usr/bin/tee
AWK=/usr/bin/awk


....within a connection test function i have this bit ....


# There wont be any yes/no question to ssh and it will
# time out on a problem server as we have used various ssh options.
# NOTE: -n is so important here.
# SSH options are explained with Variable explanations
con_server=$1
con_mainlog=$2
con_errorlog=$3

# con_test parses the config file also
#
# Main connection test and set variable as file list
# to backup if successful.

echo "\n[Con_Test for ${con_server}]" >> ${con_mainlog}
con_test_res_list=$( ${SSH} -n -l root ${con_server} 2>> ${con_errorlog} "/usr/bin/awk '/(^\/)/ {print "\$1"}' ${REM_BK_LOC_FILE}" )

# Now return file list to function call or blank if error
echo ${con_test_res_list}