diff --git a/document/linux/config/bash/module/archive.sh b/document/linux/config/bash/module/archive.sh
index 4fbeddc..2a2fcdb 100644
--- a/document/linux/config/bash/module/archive.sh
+++ b/document/linux/config/bash/module/archive.sh
@@ -2,29 +2,29 @@
 archive()
 {
   local target="$@" # target file(s).
-  local count=1     # processed count.
+  local count=0     # processed count.
   local total=$#    # total to process.
 
   # set dafult value to target all supported archives.
-  if [[ "$target" = "" ]]; then
+  if [[ "${target}" = "" ]]; then
     target="*"
     total=$(ls | wc -l)
   fi
 
   # iterate each file.
-  for file in $target; do
+  for file in ${target}; do
+    # increment counter.
+    ((count++))
+
     # status info.
-    local status="[$count/$total] $file"
+    local status="[${count}/${total}] ${file}"
     echo "${status}"
 
     # create archive.
-    tar -c "$file" | pv -s $(du -sb "$file" | awk '{print $1}') | xz -9e > "${file%/*}".tar.xz
+    tar -c "${file}" | pv -s $(du -sb "${file}" | awk '{print $1}') | xz -9e > "${file%/*}".tar.xz
     
     # append hash to file name.
     mv "${file%/*}".tar.xz "${file%/*}"_$(sha1sum "${file%/*}".tar.xz | cut -d\  -f1).tar.xz
-
-    # increment counter.
-    ((count++))
   done
 }
 
@@ -32,29 +32,29 @@ archive()
 archive_fast()
 {
   local target="$@" # target file(s).
-  local count=1     # processed count.
+  local count=0     # processed count.
   local total=$#    # total to process.
 
   # set dafult value to target all supported archives.
-  if [[ "$target" = "" ]]; then
+  if [[ "${target}" = "" ]]; then
     target="*"
     total=$(ls | wc -l)
   fi
 
   # iterate each file.
-  for file in $target; do
+  for file in ${target}; do
+    # increment counter.
+    ((count++))
+
     # status info.
-    local status="[$count/$total] $file"
+    local status="[${count}/${total}] ${file}"
     echo "${status}"
 
     # create archive.
-    tar -c "$file" | pv -s $(du -sb "$file" | awk '{print $1}') | gzip -1 > "${file%/*}".tar.gz
+    tar -c "${file}" | pv -s $(du -sb "${file}" | awk '{print $1}') | gzip -1 > "${file%/*}".tar.gz
     
     # append hash to file name.
     mv "${file%/*}".tar.gz "${file%/*}"_$(sha1sum "${file%/*}".tar.gz | cut -d\  -f1).tar.gz
-
-    # increment counter.
-    ((count++))
   done
 }
 
@@ -62,29 +62,30 @@ archive_fast()
 archive_check()
 {
   local target="$@" # target file(s).
-  local saved       # saved hash value.
-  local actual      # actual file hash value.
-  local count=1     # processed count.
+  local count=0     # processed count.
   local total=$#    # total to process.
   local failed=0    # total failed checks.
 
   # set dafult value to target all supported archives.
-  if [[ "$target" = "" ]]; then
+  if [[ "${target}" = "" ]]; then
     target="*_*.tar.*"
     total=$(ls ${target} | wc -l)
   fi
 
   # iterate each file.
-  for file in $target; do
+  for file in ${target}; do
+    # increment counter.
+    ((count++))
+
     # status info.
-    local status="[$count/$total] $file"
+    local status="[${count}/${total}] ${file}"
 
     # extract hash from name.
-    saved="${file##*_}"
+    local saved="${file##*_}"
     saved="${saved%%.*}"
 
     # calculate actual hash.
-    actual="$(pv ${file} | sha1sum | cut -d\  -f1)"
+    local actual="$(pv ${file} | sha1sum | cut -d\  -f1)"
 
     # compare hashes, show error on mismatch.
     if [[ "${actual}" = "${saved}" ]]; then
@@ -93,16 +94,15 @@ archive_check()
       echo -e "${color_red}${status}: failed.${color_default}"
       ((failed++))
     fi
-
-    # increment counter.
-    ((count++))
   done
 
   # report result.
-  if [[ ${failed} -gt 0 ]]; then
-    echo -e "${color_bred}Items failed to validate: ${failed}.${color_default}"
-  else
-    echo -e "${color_green}All successful.${color_default}"
+  if [[ ${count} -gt 1 ]]; then
+    if [[ ${failed} -gt 0 ]]; then
+      echo -e "${color_bred}Items failed to validate: ${failed}.${color_default}"
+    else
+      echo -e "${color_green}All successful.${color_default}"
+    fi
   fi
 }
 
@@ -110,39 +110,37 @@ archive_check()
 unarchive()
 {
   local target="$@" # target file(s).
-  local saved       # saved hash value.
-  local actual      # actual file hash value.
-  local count=1     # processed count.
+  local count=0     # processed count.
   local total=$#    # total to process.
   
   # set dafult value to target all supported archives.
-  if [[ "$target" = "" ]]; then
+  if [[ "${target}" = "" ]]; then
     target="*_*.tar.*"
     total=$(ls ${target} | wc -l)
   fi
 
   # iterate each file.
-  for file in $target; do
+  for file in ${target}; do
+    # increment counter.
+    ((count++))
+
     # status info.
-    local status="[$count/$total] $file"
+    local status="[${count}/${total}] ${file}"
 
     # extract hash from name.
-    saved="${file##*_}"
+    local saved="${file##*_}"
     saved="${saved%%.*}"
     
     # calculate actual hash.
-    actual="$(sha1sum $file | cut -d\  -f1)"
+    local actual="$(sha1sum ${file} | cut -d\  -f1)"
 
     # extract if hash matched or show error if not.
-    if [[ "$saved" = "$actual" ]]; then
+    if [[ "${saved}" = "${actual}" ]]; then
       echo "${status}: OK."
-      tar -xf "$file"
+      tar -xf "${file}"
     else
       echo "${status}: failed."
     fi
-
-    # increment counter.
-    ((count++))
   done
 }
 
@@ -174,7 +172,7 @@ archive_rename()
 # export everything, primarily for use with parallel..
 export -f archive archive_fast archive_check unarchive
 
-# autocompletes.
+# autocomplete.
 _archive_list()
 {
   _autocomplete "$(ls *_*.tar.* 2> /dev/null)"
diff --git a/document/linux/config/bash/module/name.sh b/document/linux/config/bash/module/name.sh
index 088188d..e9e76c1 100644
--- a/document/linux/config/bash/module/name.sh
+++ b/document/linux/config/bash/module/name.sh
@@ -3,21 +3,22 @@
 name()
 {
   local files="$@"
-  local count=1
+  local count=0
   local total=$#
 
   # all files except hidden by default.
-  if [[ "$files" = "" ]]; then
+  if [[ "${files}" = "" ]]; then
     files="[^.]*"
     total=$(ls | wc -l)
   fi
 
   # process.
-  for file in $files; do
-    local new_name
+  for file in ${files}; do
+    # increment count.
+    ((count++))
 
     # extract new name.
-    new_name=$(echo "$file" | \
+    local new_name=$(echo "${file}" | \
       sed -e "s/ /_/g" \
           -e "s/[^[:alnum:]\._-]//g" \
           -e "s/_\+/_/g" -e "s/\.\+/\./g" -e "s/-\+/-/g" \
@@ -27,29 +28,25 @@ name()
     )
 
     # status line.
-    local status="[$count/$total] $file -> $new_name"
+    local status="[${count}/${total}] ${file} -> ${new_name}"
 
     # check if same name.
-    if [[ "$file" = "$new_name" ]]; then
-      echo -e "${color_green}$status: no change.${color_default}"
-      ((count++))
+    if [[ "${file}" = "${new_name}" ]]; then
+      echo -e "${color_green}${status}: no change.${color_default}"
       continue
     fi
 
     # check if file name already exists.
-    if [[ -f "$new_name" ]]; then
-      echo -e "${color_red}$status: already exists!${color_default}"
+    if [[ -f "${new_name}" ]]; then
+      echo -e "${color_red}${status}: already exists!${color_default}"
       return 1
     fi
 
     # rename file.
-    mv -- "$file" "$new_name" &> /dev/null
+    mv -- "${file}" "${new_name}" &> /dev/null
 
     # show change.
-    echo "$status"
-
-    # increment count.
-    ((count++))
+    echo "${status}"
   done
 }
 
@@ -58,45 +55,48 @@ name()
 name_hash()
 {
   local files="$@"
-  local count=1
+  local count=0
   local total=$#
 
   # all files except hidden by default.
-  if [[ "$files" = "" ]]; then
+  if [[ "${files}" = "" ]]; then
     files="[^.]*"
     total=$(ls -p | grep -v / | wc -l)
   fi
 
   # process.
-  for file in $files; do
-    local extension
-    local new_name
-
+  for file in ${files}; do
     # process only files.
-    if [[ -f "$file" ]]; then
-      # extract new name.
-      extension="${file##*.}"
-      if [ -f "$file" ] && [ "$extension" != "$file" ]; then
-        new_name="${file%$extension}"
-      else
-        new_name="$file"
+    if [[ -f "${file}" ]]; then
+      # increment count.
+      ((count++))
+
+      # extract extension.
+      local extension="${file##*.}"
+      if [[ "${extension}" = "${file}" ]]; then
         extension=""
-      fi
-      new_name=$(sha1sum -- "$file" | cut -d\  -f1)
-      if [[ "$extension" != "" ]]; then
-        new_name="${new_name,,}.$extension"
       else
-        new_name="${new_name,,}"
+        extension=".${extension}"
+      fi
+
+      # hash the new name.
+      local hash=$(sha1sum -- "${file}" | cut -d\  -f1)
+      new_name="${hash,,}${extension}"
+      
+      # prepare status.
+      local status="[${count}/${total}] ${file} -> ${new_name}"
+
+      # check if same name.
+      if [[ "${file}" = "${new_name}" ]]; then
+        echo -e "${color_green}${status}: no change.${color_default}"
+        continue
       fi
 
       # rename file.
-      mv -- "$file" "$new_name" &> /dev/null
+      mv -- "${file}" "${new_name}" &> /dev/null
 
       # show change.
-      echo "[$count/$total] $file -> $new_name"
-
-      # increment count.
-      ((count++))
+      echo -e "${status}"
     fi
   done
 }
@@ -105,166 +105,170 @@ name_hash()
 # usage: name_hash_check [FILES]
 name_hash_check()
 {
-  local stored
-  local actual
   local files="$@"
-  local count=1
+  local count=0
   local total=$#
   local failed=0
 
   # all files by default.
-  if [[ "$files" = "" ]]; then
+  if [[ "${files}" = "" ]]; then
     files="[^.]*"
     total=$(ls -p | grep -v / | wc -l)
   fi
 
   # process.
-  for file in $files; do
+  for file in ${files}; do
     # process only files.
-    if [[ -f "$file" ]]; then
+    if [[ -f "${file}" ]]; then
+      # increment count.
+      ((count++))
+
       # status info.
-      local status="[$count/$total] $file"
+      local status="[${count}/${total}] ${file}"
 
       # extract hashes.
-      stored="${file%%.*}"
-      actual=$(sha1sum -- "$file" | cut -d\  -f1)
+      local stored="${file%%.*}"
+      local actual=$(sha1sum -- "${file}" | cut -d\  -f1)
 
       # compare hashes.
-      if [[ "$stored" = "$actual" ]]; then
+      if [[ "${stored}" = "${actual}" ]]; then
         echo -e "${status}: OK."
       else
         echo -e "${color_red}${status}: failed.${color_default}"
         ((failed++))
       fi
-
-      # increment count.
-      ((count++))
     fi
   done
 
   # report result.
-  if [[ ${failed} -gt 0 ]]; then
-    echo -e "${color_bred}Items failed to validate: ${failed}.${color_default}"
-  else
-    echo -e "${color_green}All successful.${color_default}"
+  if [[ ${count} -gt 1 ]]; then
+    if [[ ${failed} -gt 0 ]]; then
+      echo -e "${color_bred}Items failed to validate: ${failed}.${color_default}"
+    else
+      echo -e "${color_green}All successful.${color_default}"
+    fi
   fi
 }
 
 # rename files for Jellyfin series, i.e. Episode S01E01.mkv
-# usage: name_series SEASON
+# usage: name_series [SEASON]
 name_series()
 {
-  local season="$1"
+  local season="${1}"
   local files="${@:2}"
-  local count=1
+  local count=0
+  local total=$#
 
   # error when no season number specified.
-  if [[ "$season" = "" ]]; then
-    echo "usage: name_series SEASON"
+  if [[ "${season}" = "" ]]; then
+    echo "usage: name_series [SEASON]"
     return 1
   fi
 
   # all files by default.
-  if [[ "$files" = "" ]]; then
+  if [[ "${files}" = "" ]]; then
     files="[^.]*"
+    total=$(ls -p | grep -v / | wc -l)
   fi
 
   # process.
-  for file in $files; do
-    local new_name
-
+  for file in ${files}; do
     # process only files.
-    if [[ -f "$file" ]]; then
-      # extract new name.
-      new_name="Episode S${season}E$(printf %02d $count).${file##*.}"
-
-      # rename file.
-      mv -- "$file" "$new_name" &> /dev/null
-      echo "$file -> $new_name"
-
+    if [[ -f "${file}" ]]; then
       # increment episode number.
       ((count++))
+
+      # extract new name.
+      local new_name="Episode S${season}E$(printf %02d ${count}).${file##*.}"
+
+      # prepare status.
+      local status="[${count}/${total}] ${file} -> ${new_name}"
+
+      # rename file.
+      mv -- "${file}" "${new_name}" &> /dev/null
+      echo -e "${status}"
     fi
   done
 }
 
 # rename files for Kavita manga format.
-# usage: name_manga SEASON
+# usage: name_manga [SEASON]
 name_manga()
 {
   local season="$1"
   local files="${@:2}"
-  local count=1
+  local count=0
+  local total=$#
   local manga="${PWD##*/}"
 
   # error when no season number specified.
-  if [[ "$season" = "" ]]; then
-    echo "usage: name_manga SEASON"
+  if [[ "${season}" = "" ]]; then
+    echo "usage: name_manga [SEASON]"
     return 1
   fi
 
   # all files by default.
-  if [[ "$files" = "" ]]; then
+  if [[ "${files}" = "" ]]; then
     files="[^.]*"
+    total=$(ls -p | grep -v / | wc -l)
   fi
 
   # process.
-  for file in $files; do
-    local new_name
-
+  for file in ${files}; do
     # process only files.
-    if [[ -f "$file" ]]; then
-      # extract new name.
-      new_name="${manga} Vol.${season} Ch.${count}.${file##*.}"
-
-      # rename file.
-      mv -- "$file" "$new_name" &> /dev/null
-      echo "$file -> $new_name"
-
+    if [[ -f "${file}" ]]; then
       # increment episode number.
       ((count++))
+
+      # extract new name.
+      local new_name="${manga} Vol.${season} Ch.${count}.${file##*.}"
+
+      # prepare status.
+      local status="[${count}/${total}] ${file} -> ${new_name}"
+
+      # rename file.
+      mv -- "${file}" "${new_name}" &> /dev/null
+      echo -e "${status}"
     fi
   done
 }
 
 # rename files for new extension.
-# usage: name_ext EXTENSION [FILES]
+# usage: name_ext [EXTENSION] [FILES]
 name_ext()
 {
   local extension="$1"
   local files="${@:2}"
-  local count=1
+  local count=0
   local total=$#
 
   # error when no new extension specified.
-  if [[ "$extension" = "" ]]; then
-    echo "usage: name_ext EXTENSION [FILES]"
+  if [[ "${extension}" = "" ]]; then
+    echo "usage: name_ext [EXTENSION] [FILES]"
     return 1
   fi
 
   # all files by default.
-  if [[ "$files" = "" ]]; then
+  if [[ "${files}" = "" ]]; then
     files="[^.]*"
     total=$(ls -p | grep -v / | wc -l)
   fi
   
   # process.
-  for file in $files; do
-    local new_name
-
+  for file in ${files}; do
     # process only files.
-    if [[ -f "$file" ]]; then
-      # extract new name.
-      new_name="${file%.*}"."$extension"
-
-      # rename file.
-      mv -- "$file" "$new_name" &> /dev/null
-
-      # show change.
-      echo "[$count/$total] $file -> $new_name"
-
+    if [[ -f "${file}" ]]; then
       # increment count.
       ((count++))
+
+      # extract new name.
+      local new_name="${file%.*}"."${extension}"
+
+      # rename file.
+      mv -- "${file}" "${new_name}" &> /dev/null
+
+      # show change.
+      echo "[${count}/${total}] ${file} -> ${new_name}"
     fi
   done
 }
diff --git a/document/linux/config/bash/module/recursive.sh b/document/linux/config/bash/module/recursive.sh
index 5ea19bc..70ecec3 100644
--- a/document/linux/config/bash/module/recursive.sh
+++ b/document/linux/config/bash/module/recursive.sh
@@ -2,9 +2,10 @@
 # usage: recursive [COMMAND]
 recursive()
 {
+  local IFS=$'\n'
   local current="${PWD}"
   local dirs=$(find -type d)
-  local total=$(echo ${dirs} | wc -w)
+  local total=$(find -type d | wc -l) # TODO: don't call find twice. won't work with "echo ${dirs}".
   local count=0
 
   for dir in ${dirs}; do