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sudo passwd -l root Shell scripts are short programs that are written in a shell programming language. In case you want to send out emails from your PHP sites you have to configure an email client.They are interpreted by a shell process in the console. A simple one is exim4, a setup description can be found under the following links: https://help.ubuntu.com/community/Exim4 and https://wiki.debian.org/Gmail And Exim4.Clients of Unix daemons don't need to know if the daemons they depend on are actually running — all they need is the correct Unix domain sockets to be available. They are inter-process communication sockets (IPC), and they are how processes on the local system talk to each other.You can see these with $ netstat -a --protocol=unix Active UNIX domain sockets (only servers) Proto Ref Cnt Flags Type State I-Node Path unix 2 [ ACC ] STREAM LISTENING 4836 /var/run/dbus/system_bus_socket unix 9 [ ] DGRAM 4584 /dev/log unix 3 [ ] STREAM CONNECTED 489456 /tmp/orbit-carla/linc- aaa-0-476044c676da9 unix 3 [ ] STREAM CONNECTED 489455 unix 3 [ ] STREAM CONNECTED 489452 /tmp/orbit-carla/ linc-8ba-0-45fe9270a46b2 [...] As you can see the sockets have inodes, following the tradition of "everything in Unix is a file." So you can perform various operations on them with standard Linux file utilities, which is a fun topic for another day.I have no use for either, so I always disable them.
In the days of yore we had a System V (Sys V) type init daemon to manage Linux system startup, and it was good.
Overhauling key subsystems tends to give users the jitters, because it means being forced to learn new ways to administer our systems and changing our workflow, and the prospects of essential services suffering growing pains and being less-than-reliable aren't happy-making.