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Assuming the server list is a file in the following format:

server1
server2
...You could use something like this:

_slist=<your_filename>

while IFS= read -r; do
ssh "$REPLY" "$_cmd" ||
...

Yes, thanks!
Actually, more quotes are needed:

_cmd="[ -f '$_fn' ] && /usr/bin/md5sum '$_fn'"


for s in "${_server_list[@]}"; do
ssh "$s" "$_cmd" ||
printf >&2 "error executing...

#!/bin/bash

(( $# < 1 )) && {
printf "usage: %s <file_name>\n" "${0##*/}"
exit 1
}

_server_list=(
server1
server2
)

_fn=$1

_cmd=/usr/bin/md5sum

for s in...