accept-yes/accept-yes.exp

#!/usr/bin/expect -f

# This is a small script that accept unknown hosts as arguments and passes
# 'yes' to them, so they are automatically accepted in ~/.ssh/known_hosts
#
# Based on:
# http://stackoverflow.com/questions/30206430/parsing-command-line-using-argc-and-argv-in-expect
#
# Usage: ./accept-yes.exp server1 server2 ...

set count 0
if { $argc ==0 } {
    puts "No arguments passed!\n"
    exit 1
}
foreach arg $argv {
    spawn ssh -l ubuntu $arg
    expect "(yes/no)?"
    send "yes\r"
    send "exit\r"
    incr count
}
puts "\n$count nodes have been accepted as known.\n"