Check Path Age

-- Check the age of an individual file
**** Example: Monitor the age of a log file to ensure it is being written to on a regular basis.

-- Check the age of the newest file in a directory
**** Example: Monitor the age of a backup folder to ensure that nightly backups are getting created and are no older than 24 hours.

-- Check the age of the oldest file in a directory
**** Example: Monitor the age of a "queue" directory to ensure that the oldest "job" in the queue is no older than a specified limit.

-- Check the age of a non-existent file or directory
**** Example: Monitor the age of error log that only exists if errors are present.

-- Recursively check the age of all files in a directory and its sub-directories

USAGE: ./check_path_age.sh

-- PATH = Path to file or directory to check
-- WARNING_MINUTES = Age limit to issue warning alert
-- CRITICAL_MINUTES = Age limit to issue critical alert
-- oldest|newest = Check the age of either the oldest or the newest file in a directory
-- exist|noexist = Specify whether or not the path must exist
-- dig|nodig = Specify whether the script should dig down to recursively check the age of files in sub-directories.