#-- FILE:
#--  randw.sh
#-- DESCRIPTION:
#--  This script copies a number of files, chosen
#--  at random, into a sub-directory.
#--
#-- AUTHOR:
#--  mj bishop
#-- DATES: aug 02

if [ "$1" = "" ]
then
  echo '
       Usage: ./randw.txt numberOfFiles [subDirectory]

       This script selects a specified number of files
       from the current directory randomly and copies them
       into a sub-directory

       numberOfFiles   is the number of files which will
                       be copied into the sub-directory
       subDirectory    is the name of the sub-directory
                       where the files will be copied. This
                       defaults to a subdirectory named 'Lesson1'
       '
  exit 1
else
  iFiles=$1
fi


if [ "$2" = "" ]
then
  sSubDirectory=Lesson1
else
  sSubDirectory=$1
fi

ls | grep 'wav$' > fileList.txt
iFileCount=$(cat fileList.txt | wc -l | sed 's/^ *//g')
# echo "fc="$iFileCount

echo '
      Copying files into subdirectory
     '

for m in $(awk "BEGIN{for (p=0;p<$iFiles;p++) {print p}}")
do
  file=$(cat fileList.txt | awk "BEGIN{srand();n=int(rand()*$iFileCount);} NR==n")
  echo "copying file=$file"
  cp $file $sSubDirectory
done #-- infinite loop (until user presses q)