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Top Forums Shell Programming and Scripting BASH- Hold script until all contents of a file is written Post 302908932 by Michael Stora on Friday 11th of July 2014 03:17:50 PM
Old 07-11-2014
If you can't get the first applicaiton to manipulate a lockfile or otherwise signal your script, you can use incron (a cron like utility for file system events) to signal your second script that it is safe to read.

I use incron to detect the close file event for any file in my public ftp submission directory and as soon as it is done being uploaded, incron launches a script that yanks it away to a non-public directory so that every individual's uploads are private to other users whithout giving everyone a different area.

I also have a web interface to reboot my server, turn on and off anonymous FTP, share or not share my media directories (on/off or for a timeout period), etc. I know very little CGI, so instead of handling it in CGI, I save the state of the user radio button clicks and password hash to a text file and use Incron to detect a change and launch a shell script which parses and interperates it. I did it out of ignorance of CGI but I believe it is very secure.

Mike
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uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME
uudemon.admin, uudemon.cleanu, uudemon.hour, uudemon.poll - Administrative shell scripts for polling remote systems, cleaning up spool directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons SYNOPSIS
These shell scripts reside in the following directory: /usr/lib/uucp DESCRIPTION
All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the scripts, remove the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file. This script reports status to the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID (uucpa) or root. This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com- mand is run with the following parameters: -C7, -D7, X2, -o2, -W1. This script runs the uusched and uuxqt daemons in the background. This script polls the systems listed in the /usr/lib/uucp/Poll file. The uudemon.poll script should be scheduled before the uudemon.hour script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script. FILES
Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files. Contains the uucp file. RELATED INFORMATION
Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1) Files: /usr/lib/uucp delim off uudemon(4)
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