How can i record the expect session without showing the output on the stdout?

Question

I want the output of expect script to go into a log file.It seems pretty easy to do with log_file command but the problem is that i just want the output to go to the log file. when i do

 log_user 0
 log_file nameoflogfile

the log file gets created with it contents but output is also diplayed on the screen.how do i suppress the output comming to stdout.

Answer 1

If I understood you correctly you need to write log_file -a the-log-file here. According to the Expect manual:

The −a flag forces output to be logged that was suppressed by the log_user command.

By the way, outputs generated by the puts commands would not be sent to the log file created by log_file. You may consider using send_* commands (like send_user) instead of puts.