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Tags: command-line   bash   scripts  
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Title: How I can monitor for new files in a directory and drop a mail if files are not added every 30 mins?
ID: /2019/07/09/How-I-can-monitor-for-new-files-in-a-directory-and-drop-a-mail-if-files-are-not-added-every-30-mins_
Created: July 9, 2019
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The answers so far assume that files only go into a directory and never go out. But what if you have a script that empties the directory periodically? Then the script could miss the fact a file went into the directory 5 minutes ago but was processed and taken out.

Another option is using the inotifywait command written in highly efficient C language for the express purposes of monitoring file and directory creation and modification. You can install it with the command:

sudo apt install inotify-tools

The psuedo-code for an appropriate script would be:

You would call the script from a place like /etc/rc.local so it runs when machine is booted.

The advantage of this methodology is you aren’t checking the directory every 30 minutes but rather you are checking it 30 minutes after the last changes to the directory.

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