= macOS 筆記 =

== csrutil ==

* 只能在 Recovery Mode 底下關閉
* 意義：System Integrity Protection (SIP)
{{{
jazzwang:~$ csrutil 
usage: csrutil <command>
Modify the System Integrity Protection configuration. All configuration changes apply to the entire machine.
Available commands:

    clear
        Clear the existing configuration.
    disable
        Disable the protection on the machine. Only available in Recovery OS.
    enable
        Enable the protection on the machine. Only available in Recovery OS.
    status
        Display the current configuration.

    netboot
        add <address>
            Insert a new IPv4 address in the list of allowed NetBoot sources.
        list
            Print the list of allowed NetBoot sources.
        remove <address>
            Remove an IPv4 address from the list of allowed NetBoot sources.


    authenticated-root
        status
            Show the current authenticated root setting.
        disable
            Allow booting from non-sealed system snapshots. Only available in Recovery OS.
        enable
            Only allow booting from sealed system snapshots. Only available in Recovery OS.
}}}

== spotlight ==

* 先確認 SIP 是 disable，再關閉 Spotlight
{{{
jazzwang:~$ csrutil status
System Integrity Protection status: disabled.
jazzwang:~$ sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist
Password:
}}}
* 參考：https://gist.github.com/adamstac/1249295

== softwareupdate ==

* Execute the following command to instruct a computer to download a full installer for macOS 12.2: 
{{{
softwareupdate --fetch-full-installer --full-installer-version 12.2
}}}

== purge ==

* Linux 底下可以用 vm.drop_caches=3 來清除不必要的記憶體
{{{
sudo purge
}}}