frostfs-dev-env/bin/passwd.exp

#!/usr/bin/expect

set passwd [lindex $argv 0]
set args [lrange $argv 1 end]

spawn -noecho {*}$args
expect -re {^.*assword.*$}

if { $passwd == "-"} {
	send -- "\r"
} else {
	send -- "$passwd\r"
}

expect {
    "Relay transaction" {
        send "y\r"
        exp_continue
    }
    EOF
}
lassign [wait] pid spawnid os_error_flag value
exit $value