sshwait

#!/usr/bin/env bash
#
# Requirements:
#   - ssh
#
# Author: James Cherti
# URL: https://github.com/jamescherti/bash-stdops
#
# Description:
# ------------
# This script repeatedly attempts to check the availability of the SSH server on
# the host provided as the first argument. It exits with a 0 status upon
# successfully establishing a connection at least once. Note that it only
# verifies if the SSH server is reachable and does not provide a shell prompt or
# execute any commands on the remote host.
#
# Usage: ./script_name.sh <host>
#
# License:
# --------
# Copyright (C) 2012-2025 James Cherti
#
# Distributed under terms of the GNU General Public License version 3.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#
# -*- coding: utf-8 -*-

if [ "$#" -ne 1 ]; then
  echo "Usage: $0 <ssh-args-except-command>"
  exit 1
fi

HOST="$1"
while true; do
  if ssh -q -o BatchMode=yes "$HOST" true; then
    exit 0
  fi

  sleep 1
done