rename repo, subdir for yearly challenges

2020/day02/ex2.bash

@@ -0,0 +1,20 @@
+#!/bin/bash
+#
+# ex2.bash: Advent2020 game, day 2/game 2.
+
+CMD=${0##*/}
+
+declare -i beg end num found=0 nlines=0
+
+IFS=$':- \t'
+while read -r beg end char str; do
+	num=0
+	[[ ${str:beg-1:1} == "$char" ]] && ((num++))
+	[[ ${str:end-1:1} == "$char" ]] && ((num++))
+	#((num == 1 && found++))
+	((found += num == 1))
+	((nlines++))
+done
+printf "${CMD} : lines: %d matched:%d\n" "$nlines" "$found"
+
+exit 0