The whoami command.
Exactly what the name says: It displays and sets the date on a Linux system.
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
Screen Tip
date -u +%A
nslookup if it was a linux machine nslookup works too, but dig -x on a linux machine will get more info for you
To get information on the options used by a Linux command, you can use the man command followed by the command name, like this: man [command]. This will display the manual page for the command, detailing its options and usage. Alternatively, you can often use the --help option with the command (e.g., [command] --help) to get a brief summary of options and usage.
At a terminal prompt: sudo apt-get install <application-name>
To get a list of every driver your system is using (except those that are compiled into the Linux kernel) type lsmod at the command line.
They give different information, for one thing. The 'who' command is only useful for users who are currently logged into the system. It also gives log in information about when they logged in and from where. It won't tell you who they are (other than there log in name). The finger command will give information like a white pages - who the person is, where their office is, telephone number, a plan and project if they have one. It may be used whether or not the user is logged in. It also will tell you if you can communicate with them.
whereis [name of program]
yum remove -y (specific package name)
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