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I firmly believe that it is easier to once set up keys on 500 servers than to supply passwords every time you run that script (collecting 500 servers' passwords in a file is highly discouraged!).
A...

You may want to try sth like #!/bin/bash
# set -vx

while read OPTIONS SERVER
do
echo "$SERVER"
ssh "$OPTIONS" "$SERVER" <<-EOF
df / /tmp /any
EOF
...

You can also use ssh for executing commands on a remote machine.

Syntax:
ssh [user@]hostname [command]
Note that this approach will work without issuing password only if you have setup...

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