Add some notes and set the default file

diff --git a/day10/check_asteroids.sh b/day10/check_asteroids.sh
old mode 100644 (file)
new mode 100755 (executable)
index d333a33..84958ed
--- a/day10/check_asteroids.sh
+++ b/day10/check_asteroids.sh
@@ -3,7 +3,8 @@
 set -u
 set -e
 
-filename=${1:-small_grid.txt}
+basedir=$(dirname $(readlink -f ${BASH_SOURCE}))
+filename=${1:-$basedir/3_4_8.txt}
 
 exec 3<$filename
 

diff --git a/day10/notes.txt b/day10/notes.txt
new file mode 100644 (file)
index 0000000..f918aab
--- /dev/null
+++ b/day10/notes.txt
@@ -0,0 +1,4 @@
+Files in the directory, other than input.txt, are named by the standard convention: x_y_asteroids.txt
+
+The script, check_asteroids.sh, can take a filename as the first parameter, if it's not specified it'll
+run 3_4_8.txt