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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

bcrontab

bcrontab(1)						      General Commands Manual						       bcrontab(1)

NAME

       bcrontab - Manage users crontab files

SYNOPSIS

       bcrontab [ -u user ] file

       bcrontab [ -u user ] { -l | -r | -e }

DESCRIPTION

       bcrontab interfaces with the bcron-spool daemon to manage crontab files in the privileged spool directory.

OPTIONS

       -u user
	      Tell  bcron-spool  that we are acting on behalf of the named user.  bcron-spool will only accept the username if bcrontab is running
	      as either root or the same user ID as the named user.

       -l     List the cronab crontab to standard output.

       -r     Remove the user's crontab.

       -e     Edit the current crontab.

ENVIRONMENT

       VISUAL If this is set, it is used as the editor to invoke to edit a crontab.

       EDITOR If $VISUAL is not set and this is, it is used as the editor to invoke to edit a crontab.	If neither are set, /bin/vi is used.

       BCRON_SOCKET
	      The path to the named socket used to communicate with bcron-spool.  Defaults to /var/run/bcron-spool.

       LOGNAME

       USER   These two variables are used, in order, to determine the user name invoking the program.	One must be set if the -u  option  is  not
	      used.

FILES

       bcrontab  tries	to  writes  a  temporary  file	into the current directory, and then into /tmp if that fails, in order to edit the current
       crontab.

SEE ALSO

       bcron-spool(8), crontab(5)

AUTHOR

       Bruce Guenter <bruceg@em.ca>

																       bcrontab(1)
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