Execute FOR loop over ssh

I am trying to execute this code on several Solaris 10 remote boxes over ssh. I am reading some connection information from the local file ipa.txt:

#!/bin/ksh

while read hostn sid; do

   v_sid=$sid;
   ssh utest@$hostn << EOF

   for D in $(df -k |grep ora | grep -i $v_sid | awk '{print $6}')
   do
       printf "$(df -h $D |tail -1|awk '{print "FS:", $6, " usage:", $5"%"}')\n"
   done

EOF

done < ipa.txt

If I only execute the FOR loop directly into the terminal, it works. But If I put the whole script into a .ksh file and I execute that one, I receive the following error at line 3 (the line where is do, next line after FOR statement).

ksh[2]: syntax error at line 3 : `newline or ;' unexpected

There is a problem with the FOR loop but I don't understand where it is.

Any suggestion?

Thank you

Solution

The command substitution is expanded before ssh reads from the here document. If that pipeline is empty, the remote shell sees

for D in
do

which would cause your error. To send the exact text to the remote shell, escape any dollar signs that can trigger local expansions and use a format specifier for printf.

ssh utest@$hostn << EOF

   for D in \$(df -k |grep ora | grep -i \$v_sid | awk '{print \$6}')
   do
       printf '%s\n' "\$(df -h $D |tail -1|awk '{print "FS:", \$6, " usage:", \$5"%"}')"
   done

EOF