I know the title is a bit confusing but there is no other way.
Script runs and connects to remote server over ssh. This is going to run on 500 servers thatswhy I 'd like to have an output like this on the console.
echo " checking $hostname" or echo " checking ${hostname}" returns nothing. echo " checking $(hostname)" returns the hostname of the local server ironically.
ssh $Server /bin/bash <<EOF
install some software
echo "checking <remote-server-name> after installation"
java -version
groovy -v
jruby -v
EOF
I was just curious if this is doable actually. Thanx in advance.
echo " checking $hostname" or echo " checking ${hostname}" returns nothing.
That is expected. There is in general no such variable named hostname
, so you wouldn't expect a result. There is however a HOSTNAME
variable, but that's only half the problem.
echo " checking $(hostname)" returns the hostname of the local server ironically.
That's because when you use "here" document, as in
somecommand << EOF
...
EOF
The contents of the here document are evaluated for variable expansion before the input is fed to your command. This is exactly why the $(hostname)
construct is executing the hostname
command on your local system.
You can inhibit the evaluation of the here document by quoting your end marker with single quotes, like this:
ssh $Server /bin/bash <<'EOF'
install some software
echo "checking $HOSTNAME after installation"
java -version
groovy -v
jruby -v
EOF