Visit Our UNIX and Linux User Community


email when cron fails


 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers email when cron fails
# 1  
Old 03-15-2002
Question email when cron fails

I have a cronjob scheduled to run everyday. How can I obtain an email if and only if the cronjob fails?

I am using Sun Solaris (ksh).

Smilie
# 2  
Old 03-15-2002
You could write a wrapper script to run your job...
Make sure, though, to use full path names in both your cron job script, and the wrapper.

For example, if your script, let's call it fullback.ksh, makes a full backup of your /home filesystem, you could write a script like this (let's call this wrap-full.ksh):
Code:
#!/usr/bin/ksh

echo "\nStart : `/bin/date`" >> /var/adm/backup_log
/home/admin/bin/fullback.ksh >/var/adm/backup_log 2>&1
if [[ $? -ne 0 ]]; then
/bin/mail admin <<EndOfMail
Subject: Cronjob error

It looks like there was a problem with your cronjob.
Check the log at /var/adm/backup_log for details.
.
EndOfMail
fi
echo "Finish : `/bin/date`" >> /var/adm/backup_log
exit 0

This assumes, of course that your backup script will pass the return code out to it's controlling process; in this case, the wrapper script.

It should be said though, that this should be tested first, since I do not use this type of reporting myself, and I haven't tested this approach.

Hope it helps though.
# 3  
Old 03-15-2002
Thanks LivinFree for the script.

What happens to the script you have written, if there is no exit code? The script I am calling will provide me exit code only if their is some error and else no exit code is provided. Will the script work if no exit code is obtained (per your script, say, fullback.sh provides exit code only if there is some error)?
# 4  
Old 03-15-2002
What I meant by exit code is the value of $?.
Under normal circumstances, like a successfully run command, the exit code will be 0. If there's an error, it will be something else. The sample script above checks to make sure that $? = 0, and if not, it will send an email.
The concern I have is that something in whatever script is run may run successfully after the failed command... I don't know if I'm explaining very well, so I'll try to show you:
Code:
$ cat tmp1.sh
#!/bin/sh
echo
wuzzle

$ ./tmp1.sh

./tmp1.sh: wuzzle: command not found
$ echo $?
127
$ cat tmp2.sh
#!/bin/sh
wuzzle
echo

$ ./tmp2.sh
./tmp2.sh: wuzzle: command not found

$ echo $?
0

So, you see, unless you told the fullback script to "exit 1" (or exit anything not equal to 0) after any component failed, it might not email you if it does fail.

It depends completely on your script (the fullback.ksh one), is should be easy to make sure it does this correctly...

On the other hand, if you're going to be rewriting to do this, why not put them all together into one? Here's a very simple example:
Code:
#!/usr/bin/ksh
/bin/tar vcf /dev/rmt/0 /home/admin >/var/adm/backup_log 2>&1
if [[ $? -ne 0 ]]; then
/bin/mail admin <<EndOfMail
Subject: Your backup had errors

See the contents of /var/adm/backup_log
for more details.
.
EndOfMail
fi

I guess it all depends on what you're trying to do.

And please let me know if I don't make any sense... I'm kind of tired here Smilie
# 5  
Old 03-18-2002
Thanks LivinFree for the details. I understand what you are saying.

I am trying to stop/start a server (i.e, bouncing the server) through a cron job using the stop/start script provided in the server. The script returns exit value only if there is an error. (i.e, if (error) then exit 2). If there are no error, i.e, if the server stop/start without any problem, then there is no exit code. So, when there is an clean start, since exit value is nothing, what will [$? -ne 0 ] return? Will it return true or false?

Hope I have explained my problem properly.Smilie
# 6  
Old 03-19-2002
If the script does "exit 2" when it fails, you will get an email using the same logic as the script above.
If the script completes normally, then it should exit 0 and give you no email.

Did I answer your question?
# 7  
Old 03-19-2002
yep..Thanks for the information and the script.

I tested it and it works fine.

Smilie
 

Previous Thread | Next Thread
Test Your Knowledge in Computers #107
Difficulty: Easy
Each Unix kernel subsystem has key features like concurrency, virtual memory, paging, and a virtual file system.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script fails to send out email when HOSTNAME is included

Hi, Below is my script which sends out emails. more test.sh 1 #!/bin/ksh 2 { 3 print "From: Prod@mycomp.com" 4 # print "From: Prod@`hostname`.com" 5 # print "From: Prod@${HOSTNAME}.com" 6 print "To: me@mycomp.com" 7 print "Subject:... (5 Replies)
Discussion started by: mohtashims
5 Replies

2. Shell Programming and Scripting

Cron job fails with [DataDirect][ODBC lib] Connection not open error

Hi, When run the script directly...it executes as expected. But when put it in crontab the job fails with this error: Connection not open 08003: Connection not open Unable to connect to the database... how come it is not able to connect when cron job fires?... Do I need to... (7 Replies)
Discussion started by: nuthakki
7 Replies

3. Red Hat

Email program using CRON

Hi Guys... I have a bulk email program that sends out an email to a subscribed mail list. The list contains around 2000 addresses. My server is Centos 5 64bit PHP 5.2 Mysql 5.1 The program is set to send emails in batches of 100. Cron is set to run every minute Now for the problem:... (2 Replies)
Discussion started by: countrydj
2 Replies

4. UNIX for Advanced & Expert Users

Cron job fails every now and then.

I added a shell script to cron that executes every 5-15 minutes. It's used to monitor multiple environments, so it has to ssh to each machine to check the status of that machine. Sometimes, I may have more than one instance of this script running at the same time. So, here's my problem. I've... (2 Replies)
Discussion started by: mrwatkin
2 Replies

5. UNIX for Dummies Questions & Answers

If FTP cron job fails to connect = quit

Im having a problem with my ftp CRON jobs. I have another related (but not the same question in shell scripting). My FTP CRON jobs connect to a server and drop some files off, if for some reason it cannot connect to the server (timesout/password wrong etc) instead of stopping, it tries again... (3 Replies)
Discussion started by: mokachoka
3 Replies

6. Shell Programming and Scripting

cron entry fails.

Hello, I have added the following entry in my cron file: * * * * * . /home/texprd/.profile>/dev/null 2>&1; echo "test" >> /home/texprd/test.log 2>&1 The cron fails ie the added command fails to append "test" in the test.log file. However if I run the command manually from the shell... (3 Replies)
Discussion started by: mahive
3 Replies

7. Shell Programming and Scripting

Cron job fails, but works fine from command line

I have a very basic script that essentially sends a log file, via FTP, to a backup server. My cron entry to run this every night is: 55 23 * * * /usr/bin/archive_logs The script runs perfectly when executed manually, and actually worked via cron for about three weeks. However, it mysteriously... (3 Replies)
Discussion started by: cdunavent
3 Replies

8. Shell Programming and Scripting

Running script that sends an html formatted email fails when its run as cronjob

Hi Im very new at working with unix and this problem I simply can not understand. I know there are a lot of threads about problems with shell scripts behaving differently when run from a terminal and from a cronjob. I have tried everything(almost) but I still havent cracked this problem. Im... (15 Replies)
Discussion started by: Nightowl
15 Replies

9. UNIX for Dummies Questions & Answers

Cron Email Problem

I have two different cron jobs that run on the same days. The jobs are 7 hours apart. Both jobs are set to send notification emails when they start running. Both jobs always run successfully, but I only receive an email from the first job. I never get the email from the second job. ... (0 Replies)
Discussion started by: sasaliasim
0 Replies

10. Solaris

Created cron.allow file and now email fails

Getting ready for Sarbanes Oxley and I was told that I need to create a cron.allow file for the box so that only specified users can create cron jobs. That was easy enough, and I put in all the accounts that had scheduled cron jobs such as: root lp My oracle account A couple of programmer... (1 Reply)
Discussion started by: citrowske
1 Replies

Featured Tech Videos