How to verify the OS exact details?

How to verify the OS exact details?

[oracle@qtest ~]$ uname -a
Linux qtest 3.10.0-862.el7.x86_64 #1 SMP Wed Mar 21 18:14:51 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux

[oracle@qtest ~]$ cat /etc/redhat-release

Red Hat Enterprise Linux Server release 7.5 (Maipo)

[oracle@qtest ~]$ more /etc/os-release

NAME="Red Hat Enterprise Linux Server"
VERSION="7.5 (Maipo)"
ID="rhel"
ID_LIKE="fedora"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="7.5"
PRETTY_NAME="Red Hat Enterprise Linux"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:7.5:GA:server"
HOME_URL="https://www.redhat.com/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 7"
REDHAT_BUGZILLA_PRODUCT_VERSION=7.5
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="7.5"


[oracle@qtest ~]$ cat /etc/redhat-release

Red Hat Enterprise Linux Server release 7.5 (Maipo)