Ethical hacking tutorials

Handy Script to Clean Up Corefiles.(#24)
Create a file called rmcores(the author calls it handle-cores) with the following in it:

#!/bin/sh
USAGE="$0 "

if [ $# != 2 ] ; then
echo $USAGE
exit
fi

echo Deleting...
find $1 -name core -atime 7 -print -type f -exec rm {} \;

echo e-mailing
for name in `find $1 -name core -exec ls -l {} \; | cut -c16-24`
do
echo $name
cat $2 | mail $name
done

And have a cron job run it every so often.

Moving directories between filesystems.Quick way to move an entire tree of files from one disk to another (#25)
(cd /source/directory && tar cf - . ) | (cd /dest/directory && tar xvfp -)

[ Change from cd /source/directory; tar....etc. to prevent possibility of trashing directory in case of disaster.]

Finding out which directories are the largest.Ever wondered which directories are the biggest on your computer? Here's how to find out.(#26)
du -S | sort -n