OS-RELEASE(5)os-releaseOS-RELEASE(5)NAMEos-release - Operating system identification
SYNOPSIS
/etc/os-release
DESCRIPTION
The /etc/os-release file contains operating system identification data.
The basic file format of os-release is a newline-separated list of
environment-like shell-compatible variable assignments. It is possible
to source the configuration from shell scripts, however, beyond mere
variable assignments, no shell features are supported (this means
variable expansion is explicitly not supported), allowing applications
to read the file without implementing a shell compatible execution
engine. Variable assignment values should be enclosed in double or
single quotes if they include spaces, semicolons or other special
characters outside of A-Z, a-z, 0-9. All strings should be in UTF-8
format, and non-printable characters should not be used. If double or
single quotes or backslashes are to be used within variable
assignments, they should be escaped with backslashes, following shell
style. It is not supported to concatenate multiple individually quoted
strings. Lines beginning with "#" shall be ignored as comments.
/etc/os-release contains data that is defined by the operating system
vendor and should not be changed by the administrator.
As this file only encodes names and identifiers it should not be
localized.
The file /etc/os-release might be a symlink to another file, but it is
important that the file is available from earliest boot on, and hence
must be located on the root file system.
For a longer rationale for /etc/os-release please refer to the
Announcement of /etc/os-release[1].
OPTIONS
The following OS identifications parameters may be set using
/etc/os-release:
NAME=
A string identifying the operating system, without a version
component, and suitable for presentation to the user. If not set,
defaults to "NAME=Linux". Example: "NAME=Fedora" or "NAME="Debian
GNU/Linux"".
VERSION=
A string identifying the operating system version, excluding any OS
name information, possibly including a release code name, and
suitable for presentation to the user. This field is optional.
Example: "VERSION=17" or "VERSION="17 (Beefy Miracle)"".
ID=
A lower-case string (no spaces or other characters outside of 0-9,
a-z, ".", "_" and "-") identifying the operating system, excluding
any version information and suitable for processing by scripts or
usage in generated filenames. If not set, defaults to "ID=linux".
Example: "ID=fedora" or "ID=debian".
ID_LIKE=
A space-separated list of operating system identifiers in the same
syntax as the ID= setting. It should list identifiers of operating
systems that are closely related to the local operating system in
regards to packaging and programming interfaces, for example
listing one or more OS identifiers the local OS is a derivative
from. An OS should generally only list other OS identifiers it
itself is a derivative of, and not any OSes that are derived from
it, though symmetric relationships are possible. Build scripts and
similar should check this variable if they need to identify the
local operating system and the value of ID= is not recognized.
Operating systems should be listed in order of how closely the
local operating system relates to the listed ones, starting with
the closest. This field is optional. Example: for an operating
system with "ID=centos", an assignment of "ID_LIKE="rhel fedora""
would be appropriate. For an operating system with "ID=ubuntu", an
assignment of "ID_LIKE=debian" is appropriate.
VERSION_ID=
A lower-case string (mostly numeric, no spaces or other characters
outside of 0-9, a-z, ".", "_" and "-") identifying the operating
system version, excluding any OS name information or release code
name, and suitable for processing by scripts or usage in generated
filenames. This field is optional. Example: "VERSION_ID=17" or
"VERSION_ID=11.04".
PRETTY_NAME=
A pretty operating system name in a format suitable for
presentation to the user. May or may not contain a release code
name or OS version of some kind, as suitable. If not set, defaults
to "PRETTY_NAME="Linux"". Example: "PRETTY_NAME="Fedora 17 (Beefy
Miracle)"".
ANSI_COLOR=
A suggested presentation color when showing the OS name on the
console. This should be specified as string suitable for inclusion
in the ESC [ m ANSI/ECMA-48 escape code for setting graphical
rendition. This field is optional. Example: "ANSI_COLOR="0;31"" for
red, or "ANSI_COLOR="1;34"" for light blue.
CPE_NAME=
A CPE name for the operating system, following the Common Platform
Enumeration Specification[2] as proposed by the MITRE Corporation.
This field is optional. Example:
"CPE_NAME="cpe:/o:fedoraproject:fedora:17""
HOME_URL=, SUPPORT_URL=, BUG_REPORT_URL=
Links to resources on the Internet related the operating system.
HOME_URL= should refer to the homepage of the operating system, or
alternatively some homepage of the specific version of the
operating system. SUPPORT_URL= should refer to the main support
page for the operating system, if there is any. This is primarily
intended for operating systems which vendors provide support for.
BUG_REPORT_URL= should refer to the main bug reporting page for the
operating system, if there is any. This is primarily intended for
operating systems that rely on community QA. These settings are
optional, and providing only some of these settings is common.
These URLs are intended to be exposed in "About this system" UIs
behind links with captions such as "About this Operating System",
"Obtain Support", and "Report a Bug". The values should be in
RFC3986 format[3], and should be "http:" or "https:" URLs, and
possibly "mailto:" or "tel:". Only one URL shall be listed in each
setting. If multiple resources need to be referenced, it is
recommended to provide an online landing page linking all available
resources. Examples: "HOME_URL="https://fedoraproject.org/"" and
"BUG_REPORT_URL="https://bugzilla.redhat.com/""
BUILD_ID=
A string uniquely identifying the system image used as the origin
for a distribution (it is not updated with system updates). The
field can be identical between different VERSION_IDs as BUILD_ID is
an only a unique identifier to a specific version. Distributions
that release each update as a new version would only need to use
VERSION_ID as each build is already distinct based on the
VERSION_ID. This field is optional. Example:
"BUILD_ID="2013-03-20.3"" or "BUILD_ID=201303203".
If you are reading this file from C code or a shell script to determine
the OS or a specific version of it, use the ID and VERSION_ID fields,
possibly with ID_LIKE as fallback for ID. When looking for an OS
identification string for presentation to the user use the PRETTY_NAME
field.
Note that operating system vendors may choose not to provide version
information, for example to accommodate for rolling releases. In this
case, VERSION and VERSION_ID may be unset. Applications should not rely
on these fields to be set.
Operating system vendors may extend the file format and introduce new
fields. It is highly recommended to prefix new fields with an OS
specific name in order to avoid name clashes. Applications reading this
file must ignore unknown fields. Example:
"DEBIAN_BTS="debbugs://bugs.debian.org/""
EXAMPLE
NAME=Fedora
VERSION="17 (Beefy Miracle)"
ID=fedora
VERSION_ID=17
PRETTY_NAME="Fedora 17 (Beefy Miracle)"
ANSI_COLOR="0;34"
CPE_NAME="cpe:/o:fedoraproject:fedora:17"
HOME_URL="https://fedoraproject.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
SEE ALSOsystemd(1), lsb_release(1), hostname(5), machine-id(5), machine-info(5)NOTES
1. Announcement of /etc/os-release
http://0pointer.de/blog/projects/os-release
2. Common Platform Enumeration Specification
https://cpe.mitre.org/specification/
3. RFC3986 format
https://tools.ietf.org/html/rfc3986
systemd 212OS-RELEASE(5)
