But when he rehung the clocks far apart or at right angles to each other, they soon fell out of phase. Standing a table upright between the clocks had no effect on their synchronization, for instance. Perhaps pressure from the air was synchronizing their swings? He conducted various experiments. Huygens noticed that the pendulums swung exactly in unison, always lurching toward each other and then away. A pair of new pendulum clocks - a kind of timekeeping device that Huygens invented - hung side by side on the wall. Yet the phenomenon went entirely undocumented until 1665, when the Dutch physicist and inventor Christiaan Huygens spent a few days sick in bed. Objects with rhythms naturally synchronize. Neurons in our brains fire in synchronous patterns to operate our bodies and minds, and pacemaker cells in our hearts sync up to generate the beat. Indeed, we live because of synchronization. All across the United States, the power grid operates at 60 hertz, its innumerable tributaries of alternating current synchronizing of their own accord. Crickets sing in synchrony metronomes placed side by side sway into lockstep some fireflies blink together in the dark. This will start Unison both before you login and after you logout.Īpropos, other great X commands that you could put there are setxkbmap(1), xrandr(1), xmodmap(1) and xsetroot(1).When the incoherent claps of a crowd suddenly become a pulse, as everyone starts clapping in unison, who decided? Not you not anyone. Since some user intervention is preferred to investigate potential file conflicts, and we use X(7) anyway, we also here use the graphical interface of unison(1).įirst create $/.xinitrc to be sure), and include:Īnd optionally replace unity for the command to start your preferred window manager or desktop environment. You can set up key authentication between your laptop and loginb (same as sync), see sshd(8), such that you don't have to enter your password into Unison. But for this you should exclude some exceptions, and sync while not running any other programs under your user name. If you are careful, you can cleanly sync your complete home directory with Unison. If the file list disappears and the status at the bottom says Everything is up to date is all as it should be. ![]() When you are ready to start the synchronization, click Go. If you would like to not synchronize specific files you just click on them and select Skip ![]() Merge will merge the files, and click' Diff shows the differences between them (this only works with plain text files). Unison requires that you determine how to resolve the conflict, click on the Right to Left overwrites the file remote file locally, click the Left to Right, the opposite happens. At the top you will see a file with the same name, local and remote, but have different content. The picture on the left shows how a typical Unison synchronization may appear. The first synchronization may take some time depending on how large amount of data Unison now detects timestamp of last modification, permissions, ownership and i-node number for each file in both local and remote, and stores this in an archive. Unison is SSH-based so by setting up key authentication it is not required to entering the password more than once. ![]() The first time you open your profile you will be asked to authenticate, and then use your normal UiB password.
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