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KSH: Import File With Variables and Functions

How do I import variables and functions defined in lib.ksh script to another ksh script called setup.ksh under Linux / Unix like operating systems? How do I execute commands from a file in the current KSH shell?
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Lighttpd Configure Subdomain

I've main domain configured at http://example.com and I'd like to use http://support.example.com with different files. How do I add subdomain support with Lighttpd web server under UNIX or Linux operating systems?
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I want find out if a command exists on UNIX from a bash shell script. If command does not exists in $PATH, then I would like to display an error message on screen. How do I find out if a command exists on Posix system or not?
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I've multiple virtual domain hosted on CentOS Postfix server. How do I forward selected virtual domain email to yahoo / gmail or other email account using Postfix email server?
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Q. Can one Linux / BSD system respond to multiple IP address on a single Ethernet interface? I need to run multiple web sites and mod_ssl with a single server. How do I configure my box for multiple IP address?
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How To Search Shell Command History

Q. How do I search old command history under bash shell? How do I display or modify previous commands?
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Q. Is There a UNIX / Linux unerase or undelete command? How do I undelete files under a UNIX / Linux system?
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