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# dupword.awk --- find duplicate words in text
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# December 1991
# Revised October 2000
{
$0 = tolower($0)
gsub(/[^[:alnum:][:blank:]]/, " ");
$0 = $0 # re-split
if (NF == 0)
next
if ($1 == prev)
printf("%s:%d: duplicate %s\n",
FILENAME, FNR, $1)
for (i = 2; i <= NF; i++)
if ($i == $(i-1))
printf("%s:%d: duplicate %s\n",
FILENAME, FNR, $i)
prev = $NF
}