Writing a Book with Unix(joecmarshall.com)

    #!/bin/sh

    total=0

    for FILE in `find . -type f -name "*.txt"`

    do
        wc -w $FILE
        words=`wc -w < $FILE | tr -d ' '`
        total=$(($total + $words))
    done

    printf "%'d" $total

    echo " words"

    wc -w $(find . type f -name "*.txt") | sed '$s/total/words/'

    wc -w $(find . type f -name "*.txt") |
    awk -v t=0 '
      { print; t += $1 } 
      END { print t, "words"; }
    ' 

    wc -w **/*.txt(.D)

  wc -w $(find . -type f -name "*.txt")