[SOLVED] Use of "here document" in for loop

Issue

I need to wrap some code in the here document and run it with the ssh:

for service in ${services[@]}
do
ssh -tt root@${server} service=${service} 'bash -s' << 'ENDSSH'
    ps axf | grep "service-${service}" | grep -v grep | awk '{print "kill -9 " $1}' | sh
    nohup java -jar service-${service}.jar >> nohup.out 2>&1 &
ENDSSH
done

However the for loop can just do the first run and the ssh seems to catch the stdin and the for loop hangs there forever. How should I do to let the ssh return immediatly and continue the next for execution?

Solution

First, you can replace this:

ps axf | grep "service-${service}" | grep -v grep | awk '{print "kill -9 " $1}' | sh

With this:

pkill -f "service-${service}"

You can skip the "here document" and simplify:

for service in ${services[@]}
do
{
    echo "pkill -f service-${service}";
    echo "nohup java -jar service-${service}.jar >> nohup.out 2>&1 &";
} | ssh -tt root@${server}
done

Or if you prefer the heredoc:

for service in ${services[@]}
do
ssh -tt root@${server} <<EOF
    pkill -f service-${service}
    nohup java -jar service-${service}.jar >> nohup.out 2>&1 &
EOF
done

Answered By - John Zwinck