add ext to cantos

shell-scripts.d/rename-txt.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# Rename canto files
+
+for file in *;
+do
+	if [[ $file != r.sh ]]; then
+		num="$(echo $file | tr -d -c 0-9)"
+		pad="$(printf "%03d\n" $num)"
+		echo "$file: $pad"
+		mv $file "$pad-purgatorio.txt"
+	fi
+done