Need help on ssh usage in a loop of shell script - bash

Question

I need help on how to connect remote systems through ssh command in while loop of shell script. I was able to connect one remote system using ssh from shell script. Please find sample code snippet as given below…..
ssh "root#148.147.179.100" ARG1=$rpmFileName 'bash -s' <<'ENDSSH'
echo ">>Checksum ..."
md5sum /root/$ARG1
ENDSSH
When tried to run same piece of code within a loop getting the error "syntax error: unexpected end of file", which I couldn’t resolve.
But when placing the same piece of code in another script file and using that file in while loop of another script, is working.
Can anyone help me with some solution.
Please find entire code as given below...
#!/bin/sh
rpmFileName=""
file="serverIps.txt"
dir="/home/rtulluri/downloads/EVAT-1123/AxisTar";
numberOfIps=0
axisTarfileTarget='/var'
#This function checks whether given ip is valid or not
#returns 0 for valid ip, 1 for invalid ip
function valid_ip()
{
local ip=$1
local stat=1
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]
then
OIFS=$IFS
IFS='.'
ip=($ip)
IFS=$OIFS
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
stat=$?
fi
#echo "stat = $stat"
return $stat
}
#Check whether given file exists or not
if [ -s $file ]
then
echo "$file exists"
else
echo "$file doesn't exist"
echo "exiting ........"
exit
fi
IFS=,
echo "---------------"
while read sysType serverIp uid pwd
do
sysType="${sysType#"${sysType%%[![:space:]]*}"}" # remove leading whitespace characters
sysType="${sysType%"${sysType##*[![:space:]]}"}" # remove trailing whitespace characters
serverIp="${serverIp#"${serverIp%%[![:space:]]*}"}" # remove leading whitespace characters
serverIp="${serverIp%"${serverIp##*[![:space:]]}"}" # remove trailing whitespace characters
uid="${uid#"${uid%%[![:space:]]*}"}" # remove leading whitespace characters
uid="${uid%"${uid##*[![:space:]]}"}" # remove trailing whitespace characters
pwd="${pwd#"${pwd%%[![:space:]]*}"}" # remove leading whitespace characters
pwd="${pwd%"${pwd##*[![:space:]]}"}" # remove trailing whitespace characters
if [ -n "$serverIp" ]
then
valid_ip $serverIp
#Assign the return value to a variable
isValidIp=$?
else
isValidIp=1
fi
if [ $isValidIp -eq "0" ]
then
numberOfIps=$(( $numberOfIps + 1 ))
echo "$numberOfIps) $serverIp --> is valid"
if [ "$sysType" = "ebox" ]
then
echo "$serverIp is an eBox device.."
echo "About to pass $serverIp as argument to connct.sh"
#./connct.sh $serverIp
ssh "$address" ARG1=$rpmFileName 'bash -s' <<'ENDSSH'
echo ">>Checksum ..."
ENDSSH
fi
else
echo "$serverIp --> is invalid"
fi
echo ""
done < $file

Answer 1

You might try to use the '-n' ssh switch
e.g.:
for i in {1..7}
do
ssh -n myhost$i mycommand
done