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Shell Programming and Scripting

Cron Script report new files in directory

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# 1  
Old 06-01-2008
Cron Script report new files in directory
Hello,

I have a folder on my Redhat linux box that .core files are dropped into when some software we have crashes. At the moment we don't have a way to know if there has been a crash without visiting this directory manually and seeing if there are any new .core files. Can anyone think of a way/script that checks for new files and could shoot off an email? I'm only able to find tutorials / examples of triggers when an existing file changes side MD5 etc.

Your assistance is greatly appreciated.

Tar,
Mike Smilie
# 2  
Old 06-01-2008
You can use a script like this
Code:
cd /your/core/file/location
if [ -e *.core ]; then
      num=`ls *.core|wc -l`
      mail -s "Attention" name@yourmail <<message
      you have $num .corn files in /your/corn/file/location
      message
fi

# 3  
Old 06-01-2008
I have another idea. Register signal handler for SIGSEGV in the application itself and within that function block send a mail or have another binary executing the job of sending mail as a detached process. With this approach you can reduce the time difference between 'core' file creation and sending mail.

But am not sure whether you could modify the application which generates core file
# 4  
Old 06-01-2008
How about this?

Code:
# variables
TMPFILE=/tmp/corechk.$$
COREFILEPLACE=/your/core/file/location
COREFILELISTING=dumplist

# code
cd $COREFILEPLACE
[ -r $COREFILELISTING ] || touch $COREFILELISTING
ls -trC1 *.core > $TMPFILE
compare_result=`cmp $COREFILELISTING $TMPFILE 2>&1`
[ -n "$compare_result" ] && {
    mailx -s "New core file(s) found at `date`" toaddress@example.com << EOF
New core files found in $COREFILEPLACE.  They are:
`diff $COREFILELISTING $TMPFILE`
EOF
    mv $TMPFILE $COREFILELISTING
}
rm -f $TMPFILE

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