BASH Shell

How do I set default printer in my Bash shell under CentOS Linux or FreeBSD unix desktop operating systems?

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How do I check if a bash shell variable called $input is defined or not under BSD / Apple OS X / Unix / Linux like operating systems?

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How do I assign printf command result to a shell variable under Unix like operating systems?

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How do I change the default home page with Lynx browser under UNIX or Linux operating system? How do I set the startup page to http://google.co.uk with Lynx?

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How do I generate random passwords on the Linux command line using the bash shell? How to create random password using Linux command line options?

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How do I extract digits only from a given string under Bash shell?

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How do I read a file line by line under UNIX using KSH or BASH shell?

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