Unix Create a File Command

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I‘m a new Unix user. How do I create a file from bash prompt without using GUI tools? How to create a file in Unix from terminal window? What’s the easiest and best way to create a file in Unix?

Bash Assign Output of Shell Command To Variable

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How do I assign the output of a shell command to a shell variable under Unix like operating system? For example, I want to store the date command output to a variable called $now. How do you do that? How can I set a variable to the output of a command in Bash?

Linux / Unix id Command Examples

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id command

I am a new Linux and Unix system user. How do I find out the user and groups names and numeric IDs of the current user or any users on my server? How can I display and effective IDs on the system using command line options? In Linux, how do I find a user’s UID or GID?