Your VM is ready and waiting when you resume work.Let’s take a look at the pros and cons of both: Pros of Leaving Your VM On (Or in Sleep Mode When Not in Use) There are advantages and disadvantages to either practice. Leaving it on doesn’t harm it, but routinely shutting it down doesn’t, either. Just like the debate on whether or not you should shut down your computer every day, it really depends on your needs. Apple may feel at liberty to overwrite your lovely, shiny, new `shutdown` script when updating OSX, so maybe abstract out the bulk of your personal shutdown script into another place so that you can easily re-insert a single-line call to it if/when Apple overwrites it at some point.We’ve come to give an answer to that oftentimes perplexing question: how often should you shut down your Parallels Desktop virtual machine? You will also have to pass through the other parameters that Apple calls the script with - if any.ģ. Parse the parameters to the originl shutdown and see if `-r` is one of them as this means it is a `restart` shutdown. Make all the permissions the same on shutdown as shutdown.origĢ. #!/bin/bashĭo something you want done before shutdownĮxec /sbin/shutdown.orig are three things to watch out for. Then you create a bash script called shutdown that does what you want first, then execs the original Apple-supplied shutdown binary. This will work even if you shutdown your Mac from the Apple menu in the GUI.īasically, you need to su to root, like this, and rename the existing, Apple-supplied shutdown binary to shutdown.orig. Here is a way that does work (I just tested it) but it is quite technical and not for inexperienced people. If the system is about to reboot, your handler gets the message type kIOMessageSystemWillSleep."Īs you can see there is a different message for reboot, so you can handle the shutdown case exclusively. If the system is about to reboot, your handler gets the message type kIOMessageSystemWillRestart. If the system is about to be shut down, your handler is called with the message type kIOMessageSystemWillPowerOff. "To register for notification, you call registerSleepWakeInterest (described in IOKit/RootDomain.h) and register for sleep notification. Since the I/O Kit provides this functionality, you must call it from C++ code." "Although OS X does not have traditional BSD-style shutdown hooks, the I/O Kit provides equivalent functionality in recent versions. It does not look like Apple provides libraries to catch those notifications in any other language.įrom the "Kernel Programming" manual from Apple, page 150: It looks like the most straightforward way would be to write a small C++ application that would run as a daemon with launchctl, catch the shutdown notification but ignore the reboot notification (see below) and then call whatever is given to it as arguments, e.g. sudo launchctl load -w /Library/LaunchDaemons/ist Then call launchctl command which load and unload daemons/agents. # INSERT HERE THE COMMAND YOU WANT EXECUTE AT STARTUP OR SERVICE LOAD # INSERT HERE THE COMMAND YOU WANT EXECUTE AT SHUTDOWN OR SERVICE UNLOAD This script boot-shutdown.sh will be loaded and executed at every boot/shutdown. System/Library/LaunchDaemons Mac OS X System wide daemons. System/Library/LaunchAgents Mac OS X Per-user agents. Library/LaunchDaemons System wide daemons provided by the administrator. Library/LaunchAgents Per-user agents provided by the administrator. ~/Library/LaunchAgents Per-user agents provided by the user. There are many directories where the plist file could be placed, it depends from what you need, the rights of the process and so on. You can place this file into /Library/LaunchDaemons. This is a sample of the plist file you could use: Few days ago I published on github a configuration/script able to be executed at boot/shutdown.īasically on Mac OS X you could/should use a System wide and per-user daemon/agent configuration file (plist) in conjunction with a bash script file.
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