Super-presentation!!!
Wilson - Unix CommandLine Tools
  http://www.slideshare.net/EricWilson4/unix-commandline-tools

cut certain string from all the files and then - sort
$find . -name "mem_*.txt" | xargs -n 1 grep "Unfreed memory bytes: " | sort

$find . -name "mem_*.txt" | xargs -n 1 tail -n 1 | sort

#
# find a file with "102189705pdf"
# -B 1 - print before context (filled by xargs withoun -n 1)
#
$find . -name "mem_*.txt" | xargs head -n 1 | grep "1021897905pdf" -B 1


svn info | grep "^Revision:" | cut -c 11-
#                            | sed -ne 's/^Revision: //p'
#                            | awk '/^Revision:/{print $2}'
#                            | tr -d 'Revison: '