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Full Discussion: crontab fails to run script
Top Forums Shell Programming and Scripting crontab fails to run script Post 302374221 by jelloir on Monday 23rd of November 2009 08:48:38 PM
Old 11-23-2009
crontab fails to run script
OS is Ubuntu 8.04.3. When I run the command:

Code:
/usr/bin/syslogMailer < /etc/syslog.pipes/criticalMessages

From a bash shell it works and i receive an email as per the script however when run from crontab it does not work. Can anyone explain why and how to fix it?

/usr/bin/syslogMailer
Code:
#!/bin/bash

# syslogMailer: a script to read stdin and turn each line into an alert
# email typically this is used to read a named-pipe written to by syslog
#
#   example usage: syslogMailer < /etc/syslog.pipes/criticalMessages
#

alertRecipient="alerts@example.com"  # the mail recipient for alerts
sender="admininstrator@example.net" # the mail sender
TMOUT=1                                 # don't wait > 1 second for input

# process each line of input and produce an alert email
cat <<EOF | sendmail -t -oi
To: ${alertRecipient}
Reply-to: ${sender}
From: ${sender}
Subject: "critical error on syslog"

$(while read line
do
   # remove any repeated messages
   echo ${line} | grep "message repeated" > /dev/null 2>&1
   if test $? -eq 1
   then
      # output the alerts
      echo "${line}"
   fi
done)
EOF

crontab -e
Code:
# m h  dom mon dow   command
0-59/5 * * *   *     /usr/bin/syslogMailer < /etc/syslog.pipes/criticalMessages > /dev/null 2>&1

 

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LEARN ABOUT DEBIAN

kep_reload

KEP_RELOAD(1)						      General Commands Manual						     KEP_RELOAD(1)

NAME

       kep_reload - Update Predict's Keplerian elements

SYNOPSIS

	kep_reload

DESCRIPTION

       KEP_RELOAD is a simple utility that forces an immediate reload of PREDICT's Keplerian database through a socket connection while PREDICT is
       running in server mode.	It is especially useful in environments where PREDICT runs continuously, and periodic  Keplerian  element  updates
       are made outside of PREDICT, such as through scripts run through a crontab.

       The  "kepupdate"  script  found	in this directory is an example of a Keplerian element update script that can be run on an automated basis
       through a crontab.  It is designed to be placed in your home directory under a subdirectory  called  "cronjobs".   It  downloads  Keplerian
       orbital	data  from  www.celestrak.com  using  the  HTTP  protocol.   (The  "wget" utility, available from the Free Software Foundation, is
       required, and is included in many Linux distrubutions.)

       Type crontab -e to edit your crontab.  Simply add the following entry:

	       0 8 * * * kepupdate

       and your orbital database will update each morning at 8:00 AM (provided you have a network connection at that time).

       See the crontab man page for more information on editing your crontab.

AUTHOR

       This man page was written by A. Maitland Bottoms, AA4HS, for Debian GNU/Linux.

								  31 August 2003						     KEP_RELOAD(1)
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