diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60dfb11..5ee63b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,23 +1,34 @@
 # Changelog
+
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [0.1.3] - 2020-08-30
+
+### Fixed
+
+* shellcheck warnings
+
 ## [0.1.2] - 2020-05-09
 
 ### Fixed
-Include missing version information
+
+* include missing version information
 
 ### Fixed
+
 * use `printf` instead of `clear` to clear the screen
 
 ## [0.1.1] - 2020-05-09
 
 ### Fixed
+
 * use `printf` instead of `clear` to clear the screen
 
 ## [0.1.0] - 2020-05-09
 
 ### Added
+
 * all the things
diff --git a/bashcards b/bashcards
index a96c56d..2a7fa70 100755
--- a/bashcards
+++ b/bashcards
@@ -7,7 +7,7 @@ set -eou pipefail
 
 pname="bashcards"
 ext="bcrds"
-version="0.1.2"
+version="0.1.3"
 
 function version {
   echo "$version"
@@ -40,8 +40,11 @@ function dir_not_found {
 
 # to_filename transforms `/path/to/file.ext` to `file`
 function to_filename {
-  local full_filename=$(basename "$1")
-  local filename="${full_filename%.*}"
+  local full_filename
+  local filename
+
+  full_filename=$(basename "$1")
+  filename="${full_filename%.*}"
 
   echo "$filename"
 
@@ -59,23 +62,23 @@ function make_card {
   local vborder_length="$2"
   shift
   shift
-  local content="$@"
+  local content="$*"
 
   echo ""
-  printf '–%.0s' $(seq 1 $hborder_length)
+  printf '–%.0s' $(seq 1 "$hborder_length")
   echo ""
   printf "|"
-  printf ' %.0s' $(seq 1 $vborder_length)
+  printf ' %.0s' $(seq 1 "$vborder_length")
   printf "|"
   echo ""
 
   echo "|  $content  |"
 
   printf "|"
-  printf ' %.0s' $(seq 1 $vborder_length)
+  printf ' %.0s' $(seq 1 "$vborder_length")
   printf "|"
   echo ""
-  printf '–%.0s' $(seq 1 $hborder_length)
+  printf '–%.0s' $(seq 1 "$hborder_length")
   echo ""
 
   return 0
@@ -91,37 +94,43 @@ function run_cards {
   clearscreen
 
   local cards_name=$1
-  eval "declare -A cards="${2#*=}
+  eval "declare -A cards=""${2#*=}"
   local -A updated_cards
 
   local cards_keys=("${!cards[@]}")
   local cards_keys_count=${#cards_keys[@]}
-  local random_cards_key_index="$[$RANDOM % $cards_keys_count]"
+  local random_cards_key_index="$(( RANDOM % cards_keys_count ))"
   local random_cards_key="${cards_keys[$random_cards_key_index]}"
 
   local selected_key_val=("$random_cards_key" "${cards[$random_cards_key]}")
-  local random_selected_index="$[$RANDOM % 2]"
+  local random_selected_index="$(( RANDOM % 2 ))"
 
   local front="${selected_key_val[$random_selected_index]}"
   local front_length=${#front}
-  local front_hborder_length=$(( $front_length + 6 ))
-  local front_vborder_length=$(( $front_length + 4 ))
+  local front_hborder_length=$(( front_length + 6 ))
+  local front_vborder_length=$(( front_length + 4 ))
 
-  local back="${selected_key_val[$(( $random_selected_index == 0 ? 1 : 0))]}"
+  local back="${selected_key_val[$(( random_selected_index == 0 ? 1 : 0))]}"
   local back_length=${#back}
-  local back_hborder_length=$(( $back_length + 6 ))
-  local back_vborder_length=$(( $back_length + 4 ))
+  local back_hborder_length=$(( back_length + 6 ))
+  local back_vborder_length=$(( back_length + 4 ))
 
   # print cards name
-  echo "$(to_filename $cards_name)"
+  local output_name
+  output_name="$(to_filename "$cards_name")"
+  echo "$output_name"
 
   # print front
-  echo "$(make_card $front_hborder_length $front_vborder_length $front)"
+  local output_front
+  output_front="$(make_card $front_hborder_length $front_vborder_length "$front")"
+  echo "$output_front"
 
-  read -p "(Press return to flip)" _
+  read -rp "(Press return to flip)" _
 
   # print back
-  echo "$(make_card $back_hborder_length $back_vborder_length $back)"
+  local output_back
+  output_back="$(make_card $back_hborder_length $back_vborder_length "$back")"
+  echo "$output_back"
 
   for key in "${!cards[@]}"; do
     if [ "$key" != "$random_cards_key" ]; then
@@ -129,16 +138,16 @@ function run_cards {
     fi
   done
 
-  if [ ! -v updated_cards[@] ]; then
+  if [[ ! -v updated_cards[@] ]]; then
     echo ""
     echo "All done!"
-    read -p "(Press return to exit)" _
+    read -rp "(Press return to exit)" _
     exit 0
   else
-    read -p "(Press return for next card)" _
+    read -rp "(Press return for next card)" _
   fi
 
-  run_cards $cards_name "$(declare -p updated_cards)"
+  run_cards "$cards_name" "$(declare -p updated_cards)"
 
   return 0
 }
@@ -150,7 +159,7 @@ function select_file {
   local -a opts
 
   for file in "${files[@]}"; do
-    opts+=("$(to_filename $file)")
+    opts+=("$(to_filename "$file")")
   done
 
   clearscreen
@@ -168,23 +177,23 @@ function select_file {
   fi
 
   # get the input
-  read -p "> " opt
+  read -rp "> " opt
 
   # make sure the option is in
   # the list and then continue
   if
     [[ "$opt" =~ ^[0-9]+$ ]] &&
-    [ $opt -gt 0 ] &&
-    [ $opt -lt $((${#files[@]} + 1)) ]
+    [ "$opt" -gt 0 ] &&
+    [ "$opt" -lt $((${#files[@]} + 1)) ]
   then
     local selected_file="${files[$opt-1]}"
     local -A cards
 
-    while IFS=\= read key value; do
+    while IFS="=" read -r key value; do
       cards["$key"]="$value"
-    done < $selected_file
+    done < "$selected_file"
 
-    run_cards $selected_file "$(declare -p cards)"
+    run_cards "$selected_file" "$(declare -p cards)"
   else
     select_file "(Please select from the options)" "${files[@]}"
   fi
@@ -195,8 +204,8 @@ function select_file {
 function start {
   local -a files
 
-  if [ -d $1 ]; then
-    for file in $1/*.$ext; do
+  if [ -d "$1" ]; then
+    for file in "$1"/*."$ext"; do
       files+=("$file")
     done
 
@@ -215,7 +224,7 @@ function start {
 # Determine command
 
 case "$1" in
-  -d|--dir    ) [[ ! -n "${2-}" ]] && dir_not_found; start $2;;
+  -d|--dir    ) [[ -z "${2-}" ]] && dir_not_found; start "$2";;
   -h|--help   ) usage;;
   -v|--version) version;;
              *) unknown-cmd;;
diff --git a/bashcards.8 b/bashcards.8
index 3890856..bc53ca6 100644
--- a/bashcards.8
+++ b/bashcards.8
@@ -1,6 +1,6 @@
 .\" Manpage for bashcards.
 .\" Contact me@robertwpearce.com to correct errors or typos.
-.TH man 8 "08 May 2020" "0.1.0" "bashcards man page"
+.TH man 8 "30 August 2020" "0.1.3" "bashcards man page"
 .SH NAME
 bashcards \- Practice flashcards in bash
 .SH SYNOPSIS