So you have lots of Linux servers and want a quick way to know if the one you are on at the moment is running systemd or upstart or sysvinit. How should you start / stop / that service? It can be confusing with all the distro variations out there but perhaps some of these will help:
Perhaps this will help:
/usr/lib/systemd tells you you're on a systemd based system.
/usr/share/upstart is a pretty good indicator that you're on an Upstart-based system.
/etc/init.d tells you the box has SysV init in its history
The init process is always assigned PID 1. The /proc filesystem provides a way to obtain the path to an executable given a PID.
In other words:
nathan@nathan-desktop:~$ sudo stat /proc/1/exe
File: '/proc/1/exe' -> '/sbin/upstart'
As you can see, the init process on my Ubuntu 14.10 box is Upstart. Ubuntu 15.04 uses systemd, so running that command instead yields:
nathan@nathan-gnome:~$ sudo stat /proc/1/exe
File: '/proc/1/exe' -> '/lib/systemd/systemd'
If the system you're on gives /sbin/init as a result, then you'll want to try statting that file:
nathan@nathan-gnome:~$ sudo stat /proc/1/exe
File: '/proc/1/exe' -> '/sbin/init'
nathan@nathan-gnome:~$ stat /sbin/init
File: ‘/sbin/init’ -> ‘/lib/systemd/systemd’
You can also execute it to find out more:
[user@centos ~]$ /sbin/init --version
init (upstart 0.6.5)
So this is the newer in Ubuntu:
Starting with Ubuntu 15.04, Upstart will be deprecated in favor of Systemd. With Systemd to manage the services we can do the following:
systemctl start SERVICE - Use it to start a service. Does not persist after reboot
systemctl stop SERVICE - Use it to stop a service. Does not persist after reboot
systemctl restart SERVICE - Use it to restart a service
systemctl reload SERVICE - If the service supports it, it will reload the config files related to it without interrupting any process that is using the service.
systemctl status SERVICE - Shows the status of a service. Tells whether a service is currently running.
systemctl enable SERVICE - Turns the service on, on the next reboot or on the next start event. It persists after reboot.
systemctl disable SERVICE - Turns the service off on the next reboot or on the next stop event. It persists after reboot.
systemctl is-enabled SERVICE - Check if a service is currently configured to start or not on the next reboot.
systemctl is-active SERVICE - Check if a service is currently active.
systemctl show SERVICE - Show all the information about the service.
sudo systemctl mask SERVICE - Completely disable a service by linking it to /dev/null; you cannot start the service manually or enable the service.
sudo systemctl unmask SERVICE - Removes the link to /dev/null and restores the ability to enable and or manually start the service.
Virtual Audio Patching in Windows
I first found Jack audio on Linux, this video shows it on Windows. Simple use may only need the ASIO Bridge, for that skip to 10m49s
HERE ARE THE LINKS MENTIONED IN THIS VIDEO:
1. download for windows version of JACK AUDIO CONNECTION KIT
http://jackaudio.org/downloads/
2. tutorial on installing JACK AUDIO on windows
http://www.jackaudio.org/faq/jack_on_windows.html
3. download for KXSTUDIO Carla, and Cadence(Catia) for windows
http://kxstudio.sourceforge.net/Downloads
5. download VB-AUDIO ASIO BRIDGE
http://vb-audio.pagesperso-orange.fr/Cable/
6. download ASIO4ALL (optional) if you don't have a "true" ASIO SOUND CARD
http://www.asio4all.com/
In SDR, you may need to patch from one application to another. Here are some other ways to do it:
http://www.rtl-sdr.com/a-list-of-5-free-virtual-audio-cable-software-programs/
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