mdfind

List files matching a given query. More information: https://ss64.com/osx/mdfind.html.

• Find a file by its name:
  mdfind -name {{file}}
• Find a file by its content:
  mdfind "{{query}}"
• Find a file containing a string, in a given directory:
  mdfind -onlyin {{directory}} "{{query}}"