2 files changed, 20 insertions, 21 deletions
diff --git a/months.sh b/months.sh
index 4adb22e..ad3d81e 100755
--- a/months.sh
+++ b/months.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #                        _   _
 #  _ __ ___   ___  _ __ | |_| |__  ___
 # | '_ ` _ \ / _ \| '_ \| __| '_ \/ __|
@@ -9,33 +9,32 @@
 
 month=$(date +%m)
 year=$(date +%Y)
-cal -m $month $year
-read -n 1 input
+cal -m "$month" "$year"
+read -rn 1 input
 
 while [ "$input" != "q" ]
 do
 	case $input in
 		l)
 			clear
-			month=$(($month%12+1))
-			if [ $month -eq 1 ]
+			month=$((month%12+1))
+			if [ "$month" -eq 1 ]
 			then
-				year=$(($year+1))
+				year=$((year+1))
 			fi
-			cal -m $month $year
-			read -n 1 input
 			;;
 		h)
 			clear
-			month=$(($(($month-1))%12))
-			if [ $month -eq 0 ]
+			month=$(($((month-1))%12))
+			if [ "$month" -eq 0 ]
 			then
 				month=12
-				year=$(($year-1))
+				year=$((year-1))
 			fi
-			cal -m $month $year
-			read -n 1 input
 			;;
 	esac
+	clear
+	cal -m "$month" "$year"
+	read -rn 1 input
 done
 
diff --git a/years.sh b/years.sh
index a3f2f5e..65fbe5e 100755
--- a/years.sh
+++ b/years.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 #  _   _  ___  __ _ _ __ ___
 # | | | |/ _ \/ _` | '__/ __|
 # | |_| |  __/ (_| | |  \__ \
@@ -9,20 +9,20 @@
 
 year=$(date +%Y)
 cal -m -y
-read -n 1 input
+read -rn 1 input
 
 while [ "$input" != "q" ]
 do
-	case $input in
+	case "$input" in
 		l)
-			year=$(($year+1))
+			year=$((year+1))
 			;;
 		h)
-			year=$(($year-1))
+			year=$((year-1))
 			;;
 	esac
-		clear
-		cal -m -y $year
-		read -n 1 input
+	clear
+	cal -m -y "$year"
+	read -rn 1 input
 done