random-email-from-file

grep-example.sh

grep -Z -P '^From:s(.+)' mail_export.txt | uniq 

winner.sh

#!/bin/bash
##########################################################
# Extract n radom emails from a file
#
# Usage:
#   winner.sh [filename] [count]
#
# Author: Marcel Eichner // Ephigenia <love@ephigenia.de>
# Date: 2009-03-30
##########################################################
TMPFILE=`mktemp -t emails` || exit 1
grep -Z -P '^From:s(.+)' "$1" | uniq > $TMPFILE
# select random line from file
LCOUNT=`wc -l "${TMPFILE}" | awk ' { print $1; }'`
echo "Choosing ${2:-1} winners from ${LCOUNT} emails"
for (( i = 0 ; i < ${2:-1}; i++ ))
do
  LINENUMBER=$((($RANDOM % $LCOUNT) + 1))
  sed -n ${LINENUMBER}p ${TMPFILE}
done