export command

I have a man page stored in my home directory called ~/foo.1. How do I read a $HOME/foo.1 man page file? How can I read the file called ~/foo.1 as a manpage with man command?

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How do I see a list of all exported variables and functions under Unix bash shell?

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How do I run a Linux shell script? How can I run a script in Linux operating system using command line options?

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How do I use export command under Linux or Unix like operating systems to set variables?

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How do I create a shell script function using Bash under UNIX / Linux operating systems?

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Q. How do I add new path to PATH variable under Linux and UNIX operating system?

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