How can I know how many entries are in an associative array?

• 2.29: Why can't my perl program read from STDIN after I gave it ^D (EOF) ?
• 2.30: Do I always/never have to quote my strings or use semicolons?
• 2.31: How can I translate tildes in a filename?
• 2.32: How can I convert my shell script to Perl?
• 2.33: What is variable suicide and how can I prevent it?
• 2.34: Can I use Perl regular expressions to match balanced text?
• 2.35: Can I use Perl to run a telnet or ftp session?
• 2.36: What does "Malformed command links" mean?
• 2.37: How can I set up a footer format to be used with write()?
• 2.38: Why does my Perl program keep growing in size?
• 2.39: Can I do RPC in Perl?
• 2.40: What's the difference between delete and undef with %tables?
• 2.41: How do I do a "tail -f" in Perl?