Rewrite 7.sh dgsh script

Author: gliargovas

evaluation/benchmarks/dgsh/sequential/7.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# Consistent sorting across machines
+export LC_ALL=C
+
+# Convert input into a ranked frequency list
+ranked_frequency()
+{
+	awk '{count[$1]++} END {for (i in count) print count[i], i}' |
+	# We want the standard sort here
+	sort -rn
+}
+
+# Convert standard input to a ranked frequency list of specified n-grams
+ngram()
+{
+	local N=$1
+
+	perl -ne 'for ($i = 0; $i < length($_) - '$N'; $i++) {
+		print substr($_, $i, '$N'), "\n";
+	}' |
+	ranked_frequency
+}
+
+# Temporary files
+file1=$(mktemp)
+file2=$(mktemp)
+file3=$(mktemp)
+
+cat > "$file1"
+
+# Split input one word per line
+tr -cs a-zA-Z '\n' < "$file1" > "$file2"
+
+# Digram frequency
+echo "Digram frequency"
+ngram 2 < "$file2" 
+
+# Trigram frequency
+echo "Trigram frequency"
+ngram 3 < "$file2" 
+
+# Word frequency
+echo "Word frequency"
+ranked_frequency < "$file2"
+
+# Store number of characters to use in awk below
+nchars=$(wc -c < "$file1")
+
+# Character frequency
+echo "Character frequency"
+sed 's/./&\
+/g' < "$file1" | 
+# Print absolute
+ranked_frequency | tee "$file3"
+
+# Print relative
+echo "Relative character frequency"
+awk -v NCHARS=$nchars 'BEGIN {
+		OFMT = "%.2g%%"}
+		{print $1, $2, $1 / NCHARS * 100}' "$file3"
+