diff --git a/2013/misaka/.gitignore b/2013/misaka/.gitignore
index 5bf58f7fb..63951fba3 100644
--- a/2013/misaka/.gitignore
+++ b/2013/misaka/.gitignore
@@ -1,5 +1,6 @@
 horizontal_cat
 long_cat
+long_cat.txt
 long_faat_cat
 long_fat_cat
 loong_cat
@@ -15,6 +16,7 @@ misaka7.c
 misaka8.c
 misaka9.c
 same_as_long_cat
+same_as_long_cat.txt
 vertical_cat
 misaka.orig
 prog.orig
diff --git a/2013/misaka/try.sh b/2013/misaka/try.sh
index a01157e3e..f65668d71 100755
--- a/2013/misaka/try.sh
+++ b/2013/misaka/try.sh
@@ -25,6 +25,21 @@ echo 1>&2
 ./long_cat
 echo 1>&2
 
+rm -f long_cat.txt same_as_long_cat.txt
+read -r -n 1 -p "Press any key to run: ./long_cat > long_cat.txt: "
+echo 1>&2
+./long_cat > long_cat.txt
+echo 1>&2
+read -r -n 1 -p "Press any key to run: ./same_as_long_cat > same_as_long_cat.txt: "
+echo 1>&2
+./same_as_long_cat > same_as_long_cat.txt
+echo 1>&2
+
+read -r -n 1 -p "Press any key to run: diff -s long_cat.txt same_as_long_cat.txt: "
+echo 1>&2
+diff -s long_cat.txt same_as_long_cat.txt
+echo 1>&2
+
 read -r -n 1 -p "Press any key to run: ./long_faat_cat: "
 echo 1>&2
 ./long_faat_cat