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Full Discussion: BASH- Hold script until all contents of a file is written
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
This User Gave Thanks to Michael Stora For This Post:
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LEARN ABOUT DEBIAN

incron.conf

incron.conf(5)						       incron documentation						    incron.conf(5)

NAME

       /etc/incron.conf - main config file for inotify cron (incron)

DESCRIPTION

       The  file  /etc/incron.conf  contains  default  settings for the program incrond.  Each line holds a single value pair in the form option =
       value.  Comment lines must have a hash sign (#) in the first line.

       The valid configuration options are:

       system_table_dir
	      This directory is examined by incrond for system table files.  Default:/etc/incron.d

       user_table_dir
	      This directory is examined by incrond for user table files.  Default:/var/spool/incron

       allowed_users
	      This file contains users allowed to use incron.  Default:/etc/incron.allow

       denied_users
	      This file contains users denied to use incron.  Default:/etc/incron.deny

       lockfile_dir
	      This directory is used for creating a lock avoiding to run multiple instances of incrond.  Default:/var/run

       lockfile_name
	      This name (appended by '.pid') is used for creating a lock avoiding to run multiple instances of incrond.  Default:incrond

       editor This name or path is used to run as an editor for editing incron tables. Default no editor is given, system editor used, this option
	      overide this.

SEE ALSO

       incrond(8), incrontab(1), incrontab(5)

AUTHOR

       Lukas Jelinek <lukas@aiken.cz> (please report bugs to http://bts.aiken.cz or <bugs@aiken.cz>).

COPYING

       This program is free software. It can be used, redistributed and/or modified under the terms of the GNU General Public License, version 2.

Lukas Jelinek							      0.5.10							    incron.conf(5)
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