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On OSes with Systemd, reboot and halt are symlinks to systemctl.

On OSes with SysvInit, what are reboot and halt symlinks to? Is it telinit? Or are they themselves executable files, not symlinks?

Thanks.

Tim
  • 101,790

1 Answers1

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On Debian Jessie (for example), reboot may come from sysvinit-core ( https://packages.debian.org/jessie/sysvinit-core )

Downloading the file ( https://packages.debian.org/jessie/amd64/sysvinit-core/download )

$ mkdir X
$ cd X
$ ar x ../sysvinit-core_2.88dsf-59_amd64.deb
$ xz -dc < data.tar.xz | tar tvf - | egrep 'reboot|halt'
-rwxr-xr-x root/root     18776 2015-04-06 14:44 ./sbin/halt
-rw-r--r-- root/root      1753 2015-04-06 14:44 ./usr/share/man/man8/halt.8.gz
lrwxrwxrwx root/root         0 2015-04-06 14:44 ./sbin/poweroff -> halt
lrwxrwxrwx root/root         0 2015-04-06 14:44 ./sbin/reboot -> halt
lrwxrwxrwx root/root         0 2015-04-06 14:44 ./usr/share/man/man8/reboot.8.gz -> halt.8.gz
lrwxrwxrwx root/root         0 2015-04-06 14:44 ./usr/share/man/man8/poweroff.8.gz -> halt.8.gz

So we can see that halt is a separate program, and poweroff and reboot are symlinks to that.

Stephen Harris
  • 44,540