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?


I‘ve main domain configured at and I’d like to use 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, 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?


I‘ve couple of shell aliases defined in ~/.bashrc file. How do I temporarily remove (disable) a shell alias and call the core command directly without using unalias command?


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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Q. How do I search old command history under bash shell? How do I display or modify previous commands?