Shell Programming and Scripting

while read SERVER
do
  echo "$SERVER"
  ssh -x "$SERVER" /bin/sh << EOF
df / /tmp /any
# eventually more commands
EOF
done < /tmp/List.txt > /tmp/output.txt

while read SERVER
do
  echo "$SERVER"
  ssh -nx "$SERVER" '
df / /tmp /any
# eventually more commands
'
done < /tmp/List.txt > /tmp/output.txt

[root@server1:/]#
#-> ssh john@server2 df -k /tmp
The authenticity of host 'server2 (XX.XX.XX.XX)' can't be established.
RSA key fingerprint is xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'server2' (RSA) to the list of known hosts.
Password:
/tmp (xxxxxxx ) : 11444928 total allocated Kb
11386216 free allocated Kb
58712 used allocated Kb
1 % allocation used
[root@server1:/]#
#->