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Daemon

systemd — got to learn that one now

systemd has come as the default boot loader since Ubuntu 15.04. The old version, upstart, is now considered deprecated. Systemd has an interface pretty similar to the upstart service command line.

...
Command Description Support Persist
systemctl start SERVICE
Start SERVICE Always No
systemctl stop SERVICE
Stop SERVICE Always No
systemctl restart SERVICE
Restart SERVICE Always No

at job spool growing

How it works

The at command is often used to start a process at a later time. It can run any script at a specified date and time.

For instance, if you want the computer to send you a signal in one hour, use something like:

cat signal | at -q z now + 60 minutes

Assuming that the file named signal contains the commands necessary to generate the signal. Then in 60 minutes, the script will be execute and the signal will be heard or shown.

ps -ef and missing user name

I'm a Unix pro, but I still learn things every day! Today, this what I learned: ps -ef will not always show a user name. This is because the field is limited to 8 characters and if the name does not fit, the decimal number of the user is shown instead.

So ps does not show all users... and specifically that applies to hald and dbus-daemon. Beacuse the hald tool uses a small name but has a slightly different full name as haldaemon which is too long (9 characters.) And the dbus daemon tool uses the name dbusmessage (11 characters.)

That's it...

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