diff --git a/vimrc b/vimrc
index 3d2db91..916cf95 100644
--- a/vimrc
+++ b/vimrc
@@ -65,7 +65,7 @@ set ignorecase
 
 "" navigation
 " save indents on paste
-set pastetoggle=<P>
+set pastetoggle=P
 
 " move coursor on typing
 set whichwrap=b,<,>,[,],l,h
diff --git a/zsh/custom_rm b/zsh/custom_rm
index ef75a74..7ed230d 100644
--- a/zsh/custom_rm
+++ b/zsh/custom_rm
@@ -5,9 +5,10 @@ rm() {
   echo "$@" | grep -qe '-h\|--help' && { echo "Usage: rm FILE..."; return 0 }
   echo "$@" | grep -q " -" && echo "Warning: this function doesn't support any flags"
   # set trash path
-  TRASHDIR="$HOME/.local/share/Trash"
-  TRASHFILE="${TRASHDIR}/files"
-  TRASHINFO="${TRASHDIR}/info"
+  local DIRECTORY FILE
+  local TRASHDIR="${HOME}/.local/share/Trash"
+  local TRASHFILE="${TRASHDIR}/files"
+  local TRASHINFO="${TRASHDIR}/info"
   for DIRECTORY in "${TRASHDIR}" "${TRASHFILE}" "${TRASHINFO}"; do
     if [ -e "${DIRECTORY}" ]; then
       [ -d "${DIRECTORY}" ] || { echo "'${DIRECTORY}' is a file"; return 1 }
@@ -16,25 +17,25 @@ rm() {
     fi
   done
   # confirm
-  CONFIRM=""
+  local CONFIRM=""
   echo -n "Do you realy want to remove '$@'? [ny] "; read -k1 CONFIRM; echo
-  [[ ! $CONFIRM =~ [yY] ]] && return 1
+  [[ ! ${CONFIRM} =~ [yY] ]] && return 1
   # move
   for FILE in "$@"; do
-    DESTFILE="$(basename -- "${FILE}")"
-    SUFFIX='';
-    ITER=0;
+    local DESTFILE="$(basename -- "${FILE}")"
+    local SUFFIX='';
+    local ITER=0;
     while [ -e "${TRASHFILE}/${DESTFILE}${SUFFIX}" ]; do
       SUFFIX="_${ITER}";
       ITER=$(expr ${ITER} + 1)
     done
     echo "Remove '${FILE}'"
-    if [ "$(dirname -- "$(realpath -- "${FILE}")")" == "${TRASHFILE}" ]; then
-      /usr/bin/rm -rf -- "${FILE}"
-      /usr/bin/rm -rf -- "${TRASHINFO}/${DESTFILE}.trashinfo"
+    if [ "$(dirname -- "$(readlink -f -- "${FILE}")")" == "${TRASHFILE}" ]; then
+      /bin/rm -rf -- "${FILE}"
+      /bin/rm -rf -- "${TRASHINFO}/${DESTFILE}.trashinfo"
     else
       mv -- "${FILE}" "${TRASHFILE}/${DESTFILE}${SUFFIX}" || return 1
-      echo "[Trash Info]\nPath=$(realpath -- "${FILE}")\nDeletionDate=$(date +%Y-%m-%dT%H:%M:%S)" > "${TRASHINFO}/${DESTFILE}${SUFFIX}.trashinfo" || return 1
+      echo "[Trash Info]\nPath=$(readlink -f -- "${FILE}")\nDeletionDate=$(date +%Y-%m-%dT%H:%M:%S)" > "${TRASHINFO}/${DESTFILE}${SUFFIX}.trashinfo" || return 1
     fi
   done
 }
diff --git a/zsh/custom_su b/zsh/custom_su
index 9fa2718..ec511e7 100644
--- a/zsh/custom_su
+++ b/zsh/custom_su
@@ -1,15 +1,15 @@
 # redefine su command
 su() {
-  CHECKSU=0
+  local CHECKSU=0
   for FLAG in $*; do
-    [[ $FLAG == "-" ]] && CHECKSU=1
-    [[ $FLAG == "-l" ]] && CHECKSU=1
-    [[ $FLAG == "--login" ]] && CHECKSU=1
+    [[ ${FLAG} == "-" ]] && CHECKSU=1
+    [[ ${FLAG} == "-l" ]] && CHECKSU=1
+    [[ ${FLAG} == "--login" ]] && CHECKSU=1
   done
-  if [[ $CHECKSU == 0 ]]; then
+  if [[ ${CHECKSU} == 0 ]]; then
     echo "Use 'su -', Luke"
-    /usr/bin/su - $*
+    /bin/su - $*
   else
-    /usr/bin/su $*
+    /bin/su $*
   fi
 }
diff --git a/zsh/filetypes_aliases b/zsh/filetypes_aliases
index 2b7c443..ec6c437 100644
--- a/zsh/filetypes_aliases
+++ b/zsh/filetypes_aliases
@@ -1,7 +1,8 @@
 # alias -s
 alias -s {avi,mpeg,mpg,mov,m2v,mkv}=mpv
+alias -s {jpg,jpeg,png,svg,eps}=gwenview
 alias -s {mp3,flac}=qmmp
 alias -s {odt,doc,xls,ppt,docx,xlsx,pptx,csv}=libreoffice
-alias -s {pdf}=okular
+alias -s {pdf,djvu,djv}=okular
 autoload -U pick-web-browser
 alias -s {html,htm}=firefox
diff --git a/zsh/xrandr_e530 b/zsh/xrandr_e530
index 6aff8bf..0e0bc3c 100644
--- a/zsh/xrandr_e530
+++ b/zsh/xrandr_e530
@@ -2,11 +2,11 @@
 # functions to contorl xrandr
 # EXAMPLE: projctl 1024x768
 projctl() {
-  MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
+  local MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
   echo "Available monitors are: ${MONITORS}"
-  FIRSTMON="LVDS1"
-  SECONDMON="VGA1"
-  RESOLUTION="1366x768"
+  local FIRSTMON="LVDS1"
+  local SECONDMON="VGA1"
+  local RESOLUTION="1366x768"
   until [ -z $1 ]; do
     case "$1" in
       "-h" | "--help"    ) echo "Usage: projctl [ off/resol ] [ -o MON | --output MON ]" && return 0 ;;
@@ -25,11 +25,11 @@ projctl() {
 }
 
 twinmon() {
-  MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
+  local MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
   echo "Available monitors are: ${MONITORS}"
-  FIRSTMON="LVDS1"
-  SECONDMON="VGA1"
-  MODE="on"
+  local FIRSTMON="LVDS1"
+  local SECONDMON="VGA1"
+  local MODE="on"
   until [ -z $1 ]; do
     case "$1" in
       "-h" | "--help"    ) echo "Usage: twinmon [ off ] [ -o MON | --output MON ]" && return 0 ;;
diff --git a/zsh/xrandr_t440 b/zsh/xrandr_t440
index 2a58d37..fe601b4 100644
--- a/zsh/xrandr_t440
+++ b/zsh/xrandr_t440
@@ -2,11 +2,11 @@
 # functions to contorl xrandr
 # EXAMPLE: projctl 1024x768
 projctl() {
-  MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
+  local MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
   echo "Available monitors are: ${MONITORS}"
-  FIRSTMON="eDP1"
-  SECONDMON="DP2"
-  RESOLUTION="1600x900"
+  local FIRSTMON="eDP1"
+  local SECONDMON="DP2"
+  local RESOLUTION="1600x900"
   until [ -z $1 ]; do
     case "$1" in
       "-h" | "--help"    ) echo "Usage: projctl [ off/resol ] [ -o MON | --output MON ]" && return 0 ;;
@@ -26,11 +26,11 @@ projctl() {
 }
 
 twinmon() {
-  MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
+  local MONITORS="$(xrandr | grep connected | cut -d ' ' -f 1 | tr '\n' ' ')"
   echo "Available monitors are: ${MONITORS}"
-  FIRSTMON="eDP1"
-  SECONDMON="DP2"
-  MODE="on"
+  local FIRSTMON="eDP1"
+  local SECONDMON="DP2"
+  local MODE="on"
   until [ -z $1 ]; do
     case "$1" in
       "-h" | "--help"    ) echo "Usage: twinmon [ off ] [ -o MON | --output MON ]" && return 0 ;;
diff --git a/zshrc b/zshrc
index 08d47d4..3006d6b 100644
--- a/zshrc
+++ b/zshrc
@@ -80,12 +80,12 @@ alias lt='ll -t --reverse'
 alias lm='la | more'
 
 # global alias
-alias -g g='| grep'
-alias -g l='| less'
-alias -g t='| tail'
-alias -g h='| head'
-alias -g n='| wc -l'
-alias -g dn='&> /dev/null &'
+alias -g _g='| grep'
+alias -g _l='| less'
+alias -g _t='| tail'
+alias -g _h='| head'
+alias -g _n='| wc -l'
+alias -g _dn='&> /dev/null &'
 
 # to run command ignoring aliases
 hash -d b="/bin"