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-.Dd January 1, 1980
-.Dt nixos-version 8
-.Os
-.Sh NAME
-.Nm nixos-version
-.Nd show the NixOS version
-.
-.
-.
-.Sh SYNOPSIS
-.Nm nixos-version
-.Op Fl -hash
-.Op Fl -revision
-.Op Fl -configuration-revision
-.Op Fl -json
-.
-.
-.
-.Sh DESCRIPTION
-This command shows the version of the currently active NixOS configuration. For example:
-.Bd -literal -offset indent
-$ nixos-version
-16.03.1011.6317da4 (Emu)
-.Ed
-.
-.Pp
-The version consists of the following elements:
-.Bl -tag -width indent
-.It Ql 16.03
-The NixOS release, indicating the year and month in which it was released
-(e.g. March 2016).
-.It Ql 1011
-The number of commits in the Nixpkgs Git repository between the start of the
-release branch and the commit from which this version was built. This ensures
-that NixOS versions are monotonically increasing. It is
-.Ql git
-when the current NixOS configuration was built from a checkout of the Nixpkgs
-Git repository rather than from a NixOS channel.
-.It Ql 6317da4
-The first 7 characters of the commit in the Nixpkgs Git repository from which
-this version was built.
-.It Ql Emu
-The code name of the NixOS release. The first letter of the code name indicates
-that this is the N'th stable NixOS release; for example, Emu is the fifth
-release.
-.El
-.
-.
-.
-.Sh OPTIONS
-.Bl -tag -width indent
-.It Fl -hash , -revision
-Show the full SHA1 hash of the Git commit from which this configuration was
-built, e.g.
-.Bd -literal -offset indent
-$ nixos-version --hash
-6317da40006f6bc2480c6781999c52d88dde2acf
-.Ed
-.
-.It Fl -configuration-revision
-Show the configuration revision if available. This could be the full SHA1 hash
-of the Git commit of the system flake, if you add
-.Bd -literal -offset indent
-{ system.configurationRevision = self.rev or "dirty"; }
-.Ed
-.Pp
-to the
-.Ql modules
-array of your flake.nix system configuration e.g.
-.Bd -literal -offset indent
-$ nixos-version --configuration-revision
-aa314ebd1592f6cdd53cb5bba8bcae97d9323de8
-.Ed
-.
-.It Fl -json
-Print a JSON representation of the versions of NixOS and the top-level
-configuration flake.
-.El
-.
-.
-.
-.Sh AUTHORS
-.An -nosplit
-.An Eelco Dolstra
-and
-.An the Nixpkgs/NixOS contributors