linux expect自动交互脚本

#!/usr/bin/expect
set _pwd [lindex $argv 1]
set _gpg_file [lindex $argv 0]
set _text_file "gpg.txt";

spawn gpg -o "$_text_file" "$_gpg_file"
expect {
"Enter passphrase:" {
#send_user "enter pwd\n"
send "$_pwd\n"
}
}
spawn cat "$_text_file"
send_user "============================================================================\n"
interact
send_user "============================================================================\n"
spawn rm "$_text_file"
interact