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$ cat /etc/passwd | grep username

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Q: How could you check to see if a user account is already present on a Linux system?
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What is Root user in a Linux machine?

The root account is the administrative account on Linux; this account has control over everything in the system.


Administrator account on a UNIX or Linux system?

root


Where you can get Linux?

Linux is an operating system for the computer. You can purchase computers that already have Linux pre-installed on the computer. Select Dell computers come equipped with Linux.


Can you install Linux in the system which already use the windows operation system?

Yes Ubuntu-linux offers the "install along side windows" option.


Can android be replaced with Linux?

Android is a Linux based operating system means you are already running Linux over your smart device ! And you can switch Android with some other Linux version !


Can you install Linux on a computer that has another operating system already installed?

Yes. Linux can either replace the existing system or be installed alongside it in what is called "dual-booting."


Is Linux a stable operating system for using free office software?

Linux is a stable operating system for using free office software such as LibreOffice. Many varieties of Linux already have LibreOffice installed by default.


Can c be used on Linux operating system?

GCC is already for the most part preinstalled in many, if not all, GNU/Linux distributions.


What account is created when you install Linux?

By default,there is only one account, root. However, most Linux distribution will either allow or make you set up a second administrative user account.


How is Linux growing?

It is difficult to measure, but most experts agree that Linux is quickly expanding on the desktop market. On other markets Linux has already had a pretty strong presence, in many it already is the dominant operating system (Servers, Cluster/Farm Computing, Supercomputers.).


How do you install a free sound driver for your Linux system?

This is generally not necessary. Unlike in Windows, most Linux systems have all the drivers they need already present. This means if your card is not supported out of the box, there is either no driver for it at all, or it is in development and would probably not work correctly anyway. In short: you don't.


What of the accounts is built into Linux?

For the most part, every Unix-based and Unix-like (and by extension, Linux) distribution will have a root account (equivalent to a system administrator account in Windows). The remaining accounts will be allocated for the users and for certain applications.