Exploring Expect

Exercises

1. The ftp-rfc script does not understand what to do if the user enters multiple RFC numbers on the command line. Modify the script so that it handles this problem.

2. Modify ftp-rfc so that if given an argument such as "telnet“, the script first retrieves the index, then looks up which RFCs mention the argument in the title, and downloads them. Cache the index and RFCs in a public directory so that they do not have to be repeatedly downloaded.

3. Most ftp sites use a root directory where only pub is of interest. The result is that "cd pub" is always the first command everyone executes. Make the aftp script automatically cd to pub and print the directories it finds there before turning over control to interact.

4. Make the aftp script cd to pub only if pub exists.

5. Write a script to dial a pager. Use it in the error handling part of a shell script that performs a critical function such as backup or fsck.

6. The domainname procedure on page 83 is not foolproof. For example, the file resolv.conf might not exist. Assume the procedure fails on your system and ask nslookup for the current domainname.

7. Write a script that connects to a modem and dials phone numbers from a list until one answers.