Exploring Expect

Exercises

1. Use the timeout technique from the tknewsbiff script to cause an interact to return by pressing a Tk button. Compare this to using a signal.

2. The file transfer script from page 461 assumes very little of the remote host. Modify the script so that it checks for the existence of rz/sz (or other tools) on the remote machine and uses them if possible. Similarly, use gzip if possible.

3. Most compression programs can read from or write to a pipeline. Use this to reduce the number of temporary files used by the file transfer script.