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#!/bin/sh
# Print list of sls(1) hostnames that exit 0 when a connection is attempted
# and the optional given command is run. Discard stdout, but preserve stderr.
sls | while read -r hostname ; do
    # shellcheck disable=SC2029
    ssh -nq -- "$hostname" "$@" >/dev/null || continue
    printf '%s\n' "$hostname"
done