=====MacOS====
====Purge Snapshots====
<code>sudo tmutil listlocalsnapshots /
Snapshots for disk /:
com.apple.TimeMachine.2025-12-08-192342.local
com.apple.TimeMachine.2025-12-08-202601.local
com.apple.TimeMachine.2025-12-08-212950.local
com.apple.TimeMachine.2025-12-08-223025.local
com.apple.TimeMachine.2025-12-08-233034.local</code>
<code>sudo tmutil deletelocalsnapshots /
Deleted 23 Time Machine local snapshots for disk '/'</code>

====Install Soundflower====
  - Configure Soundflower
    - Audio MIDI Setup
      - Add a Multi-Output Device
        - Add Soundflower (2ch)
        - Add HDMI
    - Change speakers to Multi-Output Device
    - Change Quicktime to Soundflower (2ch) as the input
====Modify Home and End key behavior====
  - Open Terminal, don't change to root
    - <code>mkdir -p $HOME/Library/KeyBindings
echo '{
/* Remap Home / End keys to be correct */
"\UF729" = "moveToBeginningOfLine:"; /* Home */
"\UF72B" = "moveToEndOfLine:"; /* End */
"$\UF729" = "moveToBeginningOfLineAndModifySelection:"; /* Shift + Home */
"$\UF72B" = "moveToEndOfLineAndModifySelection:"; /* Shift + End */
"^\UF729" = "moveToBeginningOfDocument:"; /* Ctrl + Home */
"^\UF72B" = "moveToEndOfDocument:"; /* Ctrl + End */
"$^\UF729" = "moveToBeginningOfDocumentAndModifySelection:"; /* Shift + Ctrl + Home */
"$^\UF72B" = "moveToEndOfDocumentAndModifySelection:"; /* Shift + Ctrl + End */
}' > $HOME/Library/KeyBindings/DefaultKeyBinding.dict</code>
    - No need to reboot


====Create Symbolic Links====
Creating a symbolic links (sym link) makes the operating system, or application, think that the file or folder is in a location is it not.\\ 
In this example, I am creating sym link to store my email (Thunderbird) files on an external drive. This frees up internal disk space.
  - Backup directory or file to a safe location.
  - Copy the directory or file to an external drive.
  - Double-check the backup is correct.
  - Triple-check the backup is correct, because the next step cannot be undone.
  - Delete the original file or directory.
  - Empty the Recycle Bin.
  - The following example is the exact code I used.
    * <code>sudo ln -s /Volumes/4k-ext/tim/Library/Thunderbird/Profiles/bblzz0wg.default-release/ /Users/tim/Library/Thunderbird/Profiles/</code>
      * /Volumes/4k-ext is the external drive.
      * /Users/tim/Library is the internal drive.
  - Test.
  - Done.

I have successfully done this for Documents, Pictures, Downloads, Music, and many others. For the folders in my /usr/tim directly, I had to create sub-folders. For example, /usr/tim/Documents is now /usr/tim/Documents/Documents. Where, the latter is a sym link that points to the external drive. I chose not to modify anything in my profile hierachy in case my external drive is not available. I also backup my external drive to a NAS. Finally, my external drive is a 2TB NVMe drive connected to a 10 GB/s USB-C port.