1 files changed, 16 insertions, 0 deletions
diff --git a/awklib/eg/prog/dupword.awk b/awklib/eg/prog/dupword.awk
new file mode 100644
index 00000000..8ae0fdc7
--- /dev/null
+++ b/awklib/eg/prog/dupword.awk
@@ -0,0 +1,16 @@
+# dupword --- find duplicate words in text
+# Arnold Robbins, arnold@gnu.ai.mit.edu, Public Domain
+# December 1991
+
+{
+    $0 = tolower($0)
+    gsub(/[^A-Za-z0-9 \t]/, "");
+    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
+}