Try the man pages. In a terminal type man shutdown
"gettimeofday" is a command used in Linux and Unix, thus not capitalized. If one wishes to find information on it, the person should look for a manual or a list of Linux/Unix commands with definitions.
In Linux, command typed at a command prompt displays a list of commands that would likely contain the command you desire. For example, to find all of the commands that have word flush in their name or descriptions type the following: man -k flush
lsusb (in a terminal) will list any USB device connected to the computer.
Just search on the internet for full list of keyboard commands
In my opinion, the most commonly used Linux commands are: ls - list files and folders in a directory CD - change directory mkdir - make a directory cp - copy mv - move/rename rm - remove man - manual pages find - um, find Having a good command of all of these and you should be able to navigate around in the command line comfortably.
You can easily cycle through previously entered commands by pressing the Up key.
DNS commands, or Domain Name System commands, can be confusing. However, the website 'alliedtelesis' provides a list of DNS commands that are easy to download in a handy PDF format.
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A list of SQLplus commands is available on the Docs Oracle website. This website contains a summary table that briefly describes and lists SQLplus commands.
a list of additional commands is a sub-menu
format - formats chosen partition. I would use it when I want to switch to more modern OS, like Linux. cd - enters a directory. I'd use it to navigate around file system, perhaps to create/delete a file. shutdown - shuts computer down. I'd use it to switch my computer off when I no longer want to use it.
Look for a vi tutorial (they are usually online for Linux anyway). Or, search for "vi cheat sheet". Example is in related links.