Connect to multiple machines in sync

auto-con.exp

#!/usr/bin/expect -f

# This script automates the 'remote-con' login process.

# Check for a hostname argument.
if {$argc != 1} {
    puts "Usage: $argv0 <hostname>"
    exit 1
}
set hostname [lindex $argv 0]

# Set a timeout for expect commands (in seconds).
set timeout 20

# Start the remote-con process.
spawn remote-con $hostname

# 1. Expect the confirmation prompt and send "y".
expect "accept the connection for 30 minutes?"
send "y\r"

# 2. Expect the passphrase output and the subsequent prompt.
#    This regex captures the passphrase from the line just before
#    the "passphrase:" prompt.
expect -re "(\[a-zA-Z0-9_.-]+)\r\n.*passphrase:"

# The captured passphrase is now in the 'expect_out(1,string)' variable.
set captured_passphrase $expect_out(1,string)

# 3. Send the captured passphrase back to the prompt.
send "$captured_passphrase\r"

# 4. Hand over control of the connection to you.
#    The script is done, and you now have a live shell.
interact

connect.sh

#!/bin/bash

# A script to connect to multiple hosts using an automated expect script.

# --- IMPORTANT ---
# Set the path to your expect script here.
# Both scripts should be in the same directory or a directory in your $PATH.
EXPECT_SCRIPT="auto-con.exp"

# Check if the expect script is available and executable.
if ! command -v "$EXPECT_SCRIPT" &> /dev/null; then
    echo "Error: Expect script '$EXPECT_SCRIPT' not found in your PATH or not executable."
    echo "Please ensure both scripts are in a directory listed in your \$PATH (e.g., /usr/local/bin)."
    exit 1
fi

# Check if at least one host is provided.
if [ "$#" -eq 0 ]; then
    echo "Usage: $0 <ssh_alias1> [ssh_alias2] [ssh_alias3] ..."
    exit 1
fi

SESSION_NAME="remote-broadcast-$$"
first_host="$1"
shift

# The command to run is now the expect script with the host as an argument.
COMMAND_TO_RUN="$EXPECT_SCRIPT $first_host"

echo "Starting tmux session '$SESSION_NAME' and connecting to $first_host..."
tmux new-session -d -s "$SESSION_NAME" "$COMMAND_TO_RUN"

for host in "$@"; do
    COMMAND_TO_RUN="$EXPECT_SCRIPT $host"
    echo "Connecting to $host..."
    tmux split-window -t "$SESSION_NAME"
    tmux send-keys -t "$SESSION_NAME" "$COMMAND_TO_RUN" C-m
done

tmux select-layout -t "$SESSION_NAME" tiled
tmux set-window-option -t "$SESSION_NAME" synchronize-panes on

echo "Attaching to session. Use 'Ctrl+b' then ':set synchronize-panes off' to disable cloning."
tmux attach-session -t "$SESSION_NAME"