Linux uname Command tutorial

uname Command

1. -s , ( --kernel-name ) - Prints the kernel name.
2. -n , ( --nodename ) - Prints the system's node name (hostname). ...
3. -r , ( --kernel-release ) - Prints the kernel release.
4. -v , ( --kernel-version ) - Prints the kernel version.
5. -m , ( --machine ) - Prints the name of the machine's hardware name.

1. What is Linux uname command?
2. What does command Uname do?
3. How does Uname work?
4. What does Uname return?
5. What does df command do in Linux?
6. What does last command do in Linux?
7. Who am I command line?
8. Where is Uname stored?
9. Is Uname a system call?
10. How do I change Uname in Linux?
11. What does the command uname print when you run it without any option?
12. Which Linux kernel do I have?
13. What is the output of the who command?

What is Linux uname command?

The uname command reports basic information about a computer's software and hardware. Its syntax is. uname [options] When used without any options, uname reports the name, but not the version number, of the kernel (i.e., the core of the operating system).

What does command Uname do?

How to Display General System Information ( uname ) To display system information, use the uname command. Displays the operating system name as well as the system node name, operating system release, operating system version, hardware name, and processor type.

How does Uname work?

uname uses the system call uname(2) to get the kernel related information it shows. ... h> int uname(struct utsname *buf); where uname(2) returns information in the structure pointed to by buf . Also you can read the header file utsname.

What does Uname return?

The uname() function returns a string naming the current system in the character array sysname. Similarly, nodename contains the name that the system is known by on a communications network. The arrays release and version further identify the operating system.

What does df command do in Linux?

df (abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access. df is typically implemented using the statfs or statvfs system calls.

What does last command do in Linux?

last is a command-line utility that displays information about the last login sessions of the system users. It is very useful when you need to track user activity or investigate a possible security breach.

Who am I command line?

whoami command is used both in Unix Operating System and as well as in Windows Operating System. It is basically the concatenation of the strings “who”,”am”,”i” as whoami. It displays the username of the current user when this command is invoked. It is similar as running the id command with the options -un.

Where is Uname stored?

The uname command retrieved informations are stored in etc/hostname that hostname file contains your machine name.

Is Uname a system call?

This is a system call, and the operating system presumably knows its name, release, and version. It also knows what hardware it runs on. ... Some operating systems or libraries use a hardcoded 9 or 33 or 65 or 257.

How do I change Uname in Linux?

To change the system name:

1. Log in as root.
2. Modify the system name using the command: uname -S newname. ...
3. Relink the kernel by entering: ./link_unix. ...
4. Run mkdev mmdf and change the host name at the top of the window.
5. If you have SCO TCP/IP installed and configured, make these changes:

What does the command uname print when you run it without any option?

When the 'uname' command is run without any option then it prints just the kernel name. ... You can also use uname -s, which also displays the kernel name.

Which Linux kernel do I have?

To check Linux Kernel version, try the following commands: uname -r : Find Linux kernel version. cat /proc/version : Show Linux kernel version with help of a special file. hostnamectl | grep Kernel : For systemd based Linux distro you can use hotnamectl to display hostname and running Linux kernel version.

What is the output of the who command?

The basic syntax for using who command is as follows. 1. If you run who command without any arguments, it will display account information (user login name, user's terminal, time of login as well as the host the user is logged in from) on your system similar to the one shown in the following output.