uname linux command man page

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Referenced By 1 , 8. To this end, Linux uses the system calls 2 and 2. Among the three ways discussed here, I use uname all the time.

Kernel version can be accessed by using the -v command line option. How to print processor type? The option -i can be used for this purpose.

Linux uname command

On error, -1 is returned, and errno is set appropriately. There is no uname call in 4. It also knows what hardware it runs on. So, four of the fields of the struct are meaningful. On the other hand, the field nodename is meaningless: it gives the name of the present machine in some undefined network, but typically machines are in more than one network and have several names. Moreover, the kernel has no way of knowing about such things, so it has to be told what to answer here. The same holds for the additional domainname field. To this end, Linux uses the system calls 2 and 2. Note that there is no standard that says that the hostname set by 2 is the same string as the nodename field of the struct returned by uname indeed, some systems allow a 256-byte hostname and an 8-byte nodenamebut this is true on Linux. The same holds for 2 and the domainname field. The length of the fields in the struct varies. Some operating systems or libraries use a hardcoded 9 or 33 or 65 or 257. Clearly, it is a bad idea to use any of these constants; just use sizeof. Often 257 is chosen in order to have room for an internet hostname. The first one used length 9 for all fields; the second used 65; the third also uses 65 but adds the domainname field. The glibc uname wrapper function hides these details from applications, invoking the most recent version uname command in linux the system call provided by the kernel. A description of the project, information about reporting bugs, and the latest version of this page, can be found at Index.

For basic usage, just execute the 'uname' command sans options. How to print kernel name? The output will show you about The Author Name, The package release date, License details, Official website of this package and many more. Get the hardware platform using -i option uname command can also be used to fetch the hardware platform information. How do I know about the Linux kernel version I am using? How to find Linux kernel version I am using Ubuntu 16.