environment variable

How do I auto Logout my shell user in Linux after certain minutes of inactivity?

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How do I set environment variables using c shell (tcsh or csh) under FreeBSD UNIX or Linux operating systems? How do I save variable using csh shell under Unix like operating systems?

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How do I display shell command history with date and time under UNIX or Linux operating systems?

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I can use less or more pagers to view a file. How do I start an editor (such as vi or other text editor) to edit the current file without leaving the less or more pager command?

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I‘m behind a squid proxy server. How do I access internet via proxy server when I use wget, lynx and other utilities from a shell prompt on a Linux or Unix-like systems?

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Q. I’d like to rebuild a Debian / Ubuntu package called foo with additional option. How do I recompile .deb packages?

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Q. I’m new to Unix / Linux and I’d like to print current values of $PATH variable. How do I read $PATH from a shell prompt?

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