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Run a cronjob only when a file is modified?

 
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Top Forums UNIX for Dummies Questions & Answers Run a cronjob only when a file is modified?
# 8  
Old 02-16-2012
This is going to be a bit large to fit in one cron line, it ought to be a script:

Code:
#!/bin/sh

INPUTFILE=/my_dir_name/my_Filename
TMPFILE=/tmp/.lastupdate

if [ -f /tmp/.lastupdate ]
then
        [ $TMPFILE -nt $INPUTFILE ] && exit 0
        read SIZE < $TMPFILE
        NEWSIZE=$(/usr/bin/stat -c %s $INPUTFILE)
        if [ "$NEWSIZE" -lt "$SIZE" ]
        then
                echo "File shrunk!" >&2
                exit 1
        fi        
fi

process_my_data

/usr/bin/stat -c %s $INPUTFILE > $TMPFILE

If you ever wanted to force an update, just delete /tmp/.lastupdate and run the script.
 
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LEARN ABOUT DEBIAN

lynis

Lynis(8)						Unix System Administrator's Manual						  Lynis(8)

NAME

	Lynis - Run an system and security audit on the system

SYNOPSIS

       lynis --check-all(-c) [other options]

DESCRIPTION

       Lynis is an auditing tool for Unix (specialists). It checks the system and software configuration and logs all the found information into a
       log file for debugging purposes, and in a report file suitable to create fancy looking auditing reports.  Lynis can be run as a cronjob, or
       from the command line. It needs to have full access to the system, so running it as root (or with sudo rights) is required.

       The following system areas may be checked:

	      - Boot loader files

	      - Configuration files

	      - Common files by software packages

	      - Directories and files related to logging and auditing

OPTIONS

       --auditor <full name>
	      Define the name of the auditor/pen-tester. When a full name is used, add double quotes, like "Michael Boelen".

       --checkall (or -c)
	      Lynis  performs  a  full	check of the system, printing out the results of each test to stdout. Additional information will be saved
	      into a log file (default is /var/log/lynis.log).

	      In case the outcome of a scan needs to be automated, use the report file.

       --check-update (or --info)
	      Show program, database and update information

       --cronjob
	      Perform automatic scan with cron safe options (no colors, no questions, no breaks).

       --no-colors
	      Do not use colors for messages, warnings and sections.

       --no-log
	      Redirect all logging information to /dev/null, prevent sensitive information to be written to disk.

       --quick (-Q)
	      Do a quick scan (don't wait for user input)

       --quiet (-q)
	      Try to run as silent as possible, showing only warnings. This option activates --quick as well.

       --reverse-colors
	      Optimize screen output for light backgrounds.

       --tests TEST-IDs
	      Only run the specific test(s). When using multiple tests, add quotes around the line.

	      Multiple parameters are allowed, though some parameters can only be used together with others. When running Lynis without any param-
	      eters, help will be shown and the program will exit.

BUGS

       There are no known bugs. Bugs can be reported directly to author.

LICENSING

       Lynis is licensed under the GPL v3 license and under development by Michael Boelen.

CONTACT INFORMATION

       Project related questions and comments should be asked via http://www.rootkit.nl/contact/.

1.08								 15 December 2009							  Lynis(8)