chflags

Change file or directory flags. More information: https://ss64.com/osx/chflags.html.

• Set the hidden flag for a file:
  chflags {{hidden}} {{path/to/file}}
• Unset the hidden flag for a file:
  chflags {{nohidden}} {{path/to/file}}
• Recursively set the uchg flag for a directory:
  chflags -R {{uchg}} {{path/to/directory}}
• Recursively unset the uchg flag for a directory:
  chflags -R {{nouchg}} {{path/to/directory}}