opensnoop:tldr:86885

The command sudo opensnoop -f ${filename} is used to monitor file systems activities in real-time on a macOS system. Here's how the different parts of the command work:

• sudo: It stands for "superuser do" and is used to execute the following command with administrative privileges. It prompts the user to enter their password before granting elevated permissions.
• opensnoop: It is the name of the command-line tool being executed. It monitors file system events related to file opens.
• -f ${filename}: It is an option provided to the opensnoop command. The -f flag is used to specify a filename or directory path that the opensnoop command should monitor. ${filename} is a placeholder variable that should be replaced with the actual name of the file or directory you want to monitor. This option allows you to filter the output of opensnoop to monitor specific files or directories instead of all file system events.

By running this command with the appropriate filename or directory path, you can track all the processes or programs that interact with that particular file or directory, such as which processes open, read, write, or close the file.