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Full Discussion: cron problems
Top Forums UNIX for Dummies Questions & Answers cron problems Post 302632931 by Bros2 on Tuesday 1st of May 2012 06:58:32 AM
Old 05-01-2012
cron problems
I am trying to setup a cron that runs a script to update my ip for my domain name every time I reboot and checks if my ip changes every 5 minutes and if it does then I update it. I am running Ubuntu server 12.04.

The file /etc/cron.d/ipupdate contains
Code:
# 
#  
#  Run ipupdate
#  

# 
/5 *     * * *     root         /usr/local/bin/ipupdate
@reboot            root         /usr/local/bin/ipupdate

The file /usr/local/bin/ipupdate contains
Code:
#
#Script to enable dynamic IP
#
if [ `ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}'` != `cat /usr/local/bin/ipchange` ]
then
wget -q -O /dev/null http://freedns.afraid.org/dynamic/update.php?_USERSPECIFIC_
ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}' > /usr/local/bin/ipchange
echo `date` IP updated to `cat /usr/local/bin/ipchange` >> /home/foo/log
fi
echo `date` IP update finished running >> /home/foo/log

and the /etc/cron.d/ipchange just contains the ip from the last change.

All the above files have been set to give permission to all users (chmod 777) and when I run the script with /usr/local/bin/ipupdate it works how I want it to.
 

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LEARN ABOUT DEBIAN

bcron-update

bcron-update(8) 					      System Manager's Manual						   bcron-update(8)

NAME

       bcron-update - Update system crontabs.

SYNOPSIS

       bcron-update path [ path ...  ]

DESCRIPTION

       bcron-update  polls  the  named	files or directories periodically to see if there are any new, changed, or removed files.  When it detects
       changes, it mirrors those changes into the crontab spool directory.  bcron-update runs as root in order to be able  to  read  system  files
       that would potentially be unreadable otherwise.

       On Debian, if path is a directory, bcron-update skips files in this directory with names that do not solely consist of lower- and uppercase
       letters ('a'-'z', 'A'-'Z'), digits ('0'-'9'), underscores ('_'), and hyphens ('-').

EXAMPLES

       To mirror modern vixie-cron's behavior, use:
       bcron-update /etc/crontab /etc/cron.d

ENVIRONMENT

       BCRON_SPOOL
	    The spool directory for bcron.  Defaults to /var/spool/cron.

       BCRON_USER
	    After writing files and before moving them into their final location, bcron-update changes the ownership of the file to this  user	so
	    that bcron-sched can read them.

SEE ALSO

       bcron-sched(8)

DIAGNOSTICS

       bcron-update outputs three different kinds of messages about actions it is taking.

       Rescanning /etc/cron.d
	    The named directory has been modified, and will be scanned to determine what files have been added or deleted.

       -/etc/cron.d/oldfile
	    The named file no longer exists and will be removed from the spool.

       +/etc/cron.d/newfile
	    The named file was either created or modified since the last scan, and will be copied into the spool.

AUTHOR

       Bruce Guenter <bruceg@em.ca>

																   bcron-update(8)
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