_existdir

The _existdir built-in variable holds the results of the existdir command.

The _existdir variable is cleared when the command is executed; after execution, _existdir can contain either of four values:

• yes
  The directory exists.
• no
  Either the directory exists or the user does not have access rights.
• error
  An operating system or file error occurred while checking the file's existence.
• null character
  Initial state, directory existence has not been checked.

For example: