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@@ -0,0 +1,49 @@
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+#! /bin/bash
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+# Extract a stream of keywords from a file
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+#
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+# This is an applicaton of Marcus Ranum's principal of "Artificial Ignorance"
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+# http://www.ranum.com/security/computer_security/papers/ai/
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+#
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+# Usage: ai input-file term1 [term2 ...]
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+#
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+# Input:
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+# - input-file on the command line
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+# - terms - one or more on the command line
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+#
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+# Output:
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+# - ai-TERM1.txt
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+# - ai-TERM2.txt
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+# - ...
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+# - ai-TERMn.txt
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+# - ai-leftovers.txt
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+# set -e
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+set -u
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+
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+PREFIX=ai-
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+LEFTOVERS=ai-leftovers.txt
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+LEFTOVERS_TMP=/dev/null
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+
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+INPUT=${1:-""}
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+OUTOUT=""
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+
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+if [ "$INPUT" == "" ]; then
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+ echo Need file on command line
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+ exit 1
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+else
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+ shift
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+fi
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+
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+for var in "$@"
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+do
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+ OUTPUT="${PREFIX}${var}.txt"
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+ PATTERN="${var}"
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+ LEFTOVERS_TMP="ai-leftovers-${var}.tmp"
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+
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+ cat $INPUT | tee >(egrep -i $PATTERN > $OUTPUT) | (egrep -vi $PATTERN > $LEFTOVERS_TMP)
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+
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+
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+ INPUT=$LEFTOVERS_TMP
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+done
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+
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+cp $LEFTOVERS_TMP $LEFTOVERS
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+rm -f ai-*.tmp || echo no leftovers
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