Bash assign output to variable inside here document

Question

In a bash script, what I need is to ssh to a server and do some commands, what I got so far is like this:

outPut=\"ss\"
ssh user@$serverAddress <         


        

Answer 1

No, sorry that will not work.

1. Either use command substitution value (to printf) inside the here-doc (lines bettween EOF):

   ssh user@$serverAddress << EOF
       printf 'output is %s\n' "$(ls -l /opt/logs)"
   EOF
   

2. Or you capture the execution of command from inside ssh, and then use the value.

   outPut="$( 
       ssh user@$serverAddress << EOF
           cd /opt/logs
           ls -l
   EOF
   )"
   echo 'output is ' "$outPut"
   echo "${outPut}"
   

Option 1 looks cleaner.