"init --version" does not work

[Robie Basak]

According to init(1), --version is expected to work. But instead I get:

$ init --version
init: unrecognized option '--version'

As we switch from upstart to systemd, I wanted to check which I was running, and this seemed like an obvious way to do it.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: systemd-sysv 219-4ubuntu5
ProcVersionSignature: User Name 3.19.0-9.9-generic 3.19.1
Uname: Linux 3.19.0-9-generic x86_64
ApportVersion: 2.16.2-0ubuntu3
Architecture: amd64
Date: Wed Mar 18 14:18:59 2015
Ec2AMI: ami-00000c76
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.medium
Ec2Kernel: aki-00000548
Ec2Ramdisk: ari-00000548
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)

[Didier Roche-Tolomelli (didrocks)]

that's interesting:
$ ls -l /sbin/init
lrwxrwxrwx 1 root root 20 mars 11 11:22 /sbin/init -> /lib/systemd/systemd
$ /sbin/init --help
init [OPTIONS...] {COMMAND}

Send control commands to the init daemon.
$ /lib/systemd/systemd --help
systemd [OPTIONS...]

Starts up and maintains the system or user services.

-> seems help commands changes depending on systemd binary on user's name.

@Robie: you can use systemctl --version in the interim term.

[Nick Rosbrook (enr0n)]

From systemd(1):

For compatibility with SysV, if the binary is called as init and is not the first process on the machine (PID is not 1), it will execute telinit and pass all command line arguments unmodified. That means init and telinit are mostly equivalent when invoked from normal login sessions. See telinit(8) for more information.

Looking at telinit(8), there is no --version flag. I think things are working as expected.

(I realize the man pages may have changed over time, just doing some bug cleanup).