Send email on script error

Shell Programming and Scripting
1

I need to start off by saying that I am not much of a programmer and know enough to cause lots of trouble.

I've been writing this script to decrypt an XML feed, then parse the feed into a database. The script is executed from cron.

#!/bin/sh

PGPPATH=/path/to/directory
        echo "pgp directory $PGPPATH"
        if [ -f ${PGPPATH}/*.pgp ];
        then
        for FILE in ${PGPPATH}/*.pgp;
                do
                        echo "decrypting $FILE"
                        /bin/echo mypassword | /usr/bin/gpg --no-tty --batch --passphrase-fd 0 --quiet --output ${FILE%.pgp}.xml --decrypt $FILE
                        echo "parsing xml"
                        /usr/bin/java -jar /root/XmlParse/XmlParser.jar "${FILE%.pgp}.xml" "jdbc:mysql://127.0.0.1/mydb" "admin" "mypassword"
                        echo "moving $FILE to ${PGPPATH}/feed_archive"
                        mv $FILE ${PGPPATH}/feed_archive
                        echo "moved $FILE to ${PGPPATH}/feed_archive";
                        mv ${PGPPATH}/*.xml ${PGPPATH}/xml
                        echo "mv ${PGPPATH}/*.xml ${PGPPATH}/xml";
                done
        else
        echo "pgp files do not exists"
        fi

The results are stored in a log. Here is an example of the log entry:

pgp directory /path/to/directory
decrypting /path/to/directory/IL_200902040703.pgp
parsing xml
working...
completed!
moving /path/to/directory/IL_200902040703.pgp to /path/to/directory/feed_archive
moved /path/to/directory/IL_200902040703.pgp to /path/to/directory/feed_archive
mv /path/to/directory/*.xml /path/to/directory/xml

Occasionally, the XmlParser.jar fails. I know it fails because the log above is missing the "completed!". When I run the script form the command line, I can see a java error stack. What I need is to have an email triggered containing the java error when the XmlParser.jar fails. Thanks in advance for any suggestions.

2

Why can't you do error checking after that java call?

/usr/bin/java -jar /root/XmlParse/XmlParser.jar "${FILE%.pgp}.xml" "jdbc:mysql://127.0.0.1/mydb" "admin" "mypassword"

rc=$?
if [[ $rc -ne 0 ]]; then
echo "Error parsing file ($rc)"|mailx -s "Subject" toaddress
else
echo "Moving $FILE to ${PGPPATH}/feed_archive..."
etc...
fi

3

Thanks giannicello.

I didn't know how to do error checking in the shell script. You gave me what I needed. Thank you.

4

Your suggestion worked. I received an email with the following message in the body.

Error parsing file (1)

How do I email the contents of the exception thread?

Thanks in advance.

5

think this'll work:


java stuff . .. . . . > java.log 2>&1

rc=$?

if [[ $rc -ne 0 ]]; then

(
echo "Error parsing file ($rc)"
echo
cat java.log
) |mailx -s "Subject" toaddress

fi

oh you mean the log of the whole shell script????

try putting everything into a function:

all_of_my_code()
{

blah
blah
blah

if [ any-errors ] then
  return 1
fi
}


all_of_my_code > log 2>&1

if [ $? -ne 0 ]; then
  (
  echo problems
  echo
  cat log
  ) | mailx to_me
fi
6

Perfect. Thanks quirkasaurus. This worked great. I used your first example.

7

The exception thread should be stdout, redirect it (and stderr if you want) to the log file, then include the log in the body.

#!/bin/sh
 
exec 1>$0".log"            #just stdout
exec > $0".log" 2>&1    #stdout and stderr
.
.
.

no need to put the code in a function, just add this before your code (only one of the lines). then cat the log into the mail body as directed earlier