Linux?
?
- . , systemd, .
Linux hostnamectl - . , .

GNU/Linux Linux-. , Linux - , GNU - . GNU Linux , . , GNU/Linux Lignux.
Linux
, , , - .
- rpm - RedHat
- dpkg - Debian
- pacman - Arch
, rpm, RHEL, CentOS, Fedora .. deb, Ubuntu, Debian, Mint. pacman Arch Manjaro ( ).
$ for i in $( echo rpm dpkg pacman ); do which $i; done 2 /dev/null
deb rpm : /usr/bin/dpkg /bin/rpm .

CentOS/RHEL
CentOS /etc/centos-release cat /etc/centos-release
RHEL /etc/redhat-release
:
cat /etc/redhat-release
, Fedora fedora-release - .
Debian, Mint Ubuntu
Debian - /etc/issue:
cat /etc/issue

Arch
Arch , pacman -Suy
.
Linux uname -a.
:
uname - a
.

:
lscpu
, .
