diff --git a/sh/fasd b/sh/fasd
new file mode 100644
index 0000000..4642a25
--- /dev/null
+++ b/sh/fasd
@@ -0,0 +1,680 @@
+#!/usr/bin/env sh
+
+# Fasd (this file) can be sourced or executed by any POSIX compatible shell.
+
+# Fasd is originally written based on code from z (https://github.com/rupa/z)
+# by rupa deadwyler under the WTFPL license. Most if not all of the code has
+# been rewritten.
+
+# Copyright (C) 2011, 2012 by Wei Dai. All rights reserved.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+get_vcs() {
+    local begin_path=$1
+    cd "$begin_path"
+    while [ "$PWD" != "/" ]; do
+        if { [ -d .git ] || [ -d .hg ] ;} then
+            echo $PWD
+            return
+        fi
+        cd ..
+    done
+    echo "$begin_path"
+}
+
+fasd() {
+
+  # make zsh do word splitting inside this function
+  [ "$ZSH_VERSION" ] && emulate sh && setopt localoptions
+
+  case $1 in
+  --init) shift
+    while [ "$1" ]; do
+      case $1 in
+        env)
+          { # Load configuration file based on XDG Base Directory Spec.
+
+          if [ -s "$XDG_CONFIG_HOME/fasd/config" ]; then
+            . "$XDG_CONFIG_HOME/fasd/config"
+          # Fallback for when $XDG_CONFIG_HOME is unset
+          elif [ -s "$HOME/.config/fasd/config" ]; then
+            . "$HOME/.config/fasd/config"
+          elif [ -s "$XDG_CONFIG_DIRS/fasd/config" ]; then
+            . "$XDG_CONFIG_DIRS/fasd/config"
+          # Fallback for when $XDG_CONFIG_DIRS is unset
+          elif [ -s "/etc/xdg/fasd/config" ]; then
+            . "/etc/xdg/fasd/config"
+          # Fallback to old rc for backward compatibility
+          else
+            [ -s "/etc/fasdrc" ] && . "/etc/fasdrc"
+            [ -s "$HOME/.fasdrc" ] && . "$HOME/.fasdrc"
+          fi
+
+          # set default options
+          [ -z "$_FASD_GREP" ] && _FASD_GREP=grep
+          if [ -z "$_FASD_DATA" ]; then
+            if [ -n "$XDG_CACHE_HOME" ]; then
+              _FASD_DATA="$XDG_CACHE_HOME/fasd"
+            else
+              _FASD_DATA="$HOME/.cache/fasd"
+            fi
+          fi
+          [ -z "$_FASD_BLACKLIST" ] && _FASD_BLACKLIST="--help"
+          [ -z "$_FASD_SHIFT" ] && _FASD_SHIFT="sudo busybox"
+          [ -z "$_FASD_IGNORE" ] && _FASD_IGNORE="fasd ls echo"
+          [ -z "$_FASD_SINK" ] && _FASD_SINK=/dev/null
+          [ -z "$_FASD_TRACK_PWD" ] && _FASD_TRACK_PWD=1
+          [ -z "$_FASD_MAX" ] && _FASD_MAX=2000
+          [ -z "$_FASD_BACKENDS" ] && _FASD_BACKENDS=native
+          [ -z "$_FASD_FUZZY" ] && _FASD_FUZZY=2
+          [ -z "$_FASD_VIMINFO" ] && _FASD_VIMINFO="$HOME/.viminfo"
+          [ -z "$_FASD_RESOLVE_SYMLINKS" ] && _FASD_RESOLVE_SYMLINKS=0
+          [ -z "$_FASD_ONLY_VCS" ] && _FASD_ONLY_VCS=1
+          [ -z "$_FASD_RECENTLY_USED_XBEL" ] && \
+            _FASD_RECENTLY_USED_XBEL="$HOME/.local/share/recently-used.xbel"
+          [ -z "$_FASD_NOCASE" ] && _FASD_NOCASE=0
+
+          if [ -z "$_FASD_AWK" ]; then
+            # awk preferences
+            local awk; for awk in mawk gawk original-awk nawk awk; do
+              $awk "" && _FASD_AWK=$awk && break
+            done
+          fi
+        } >> "${_FASD_SINK:-/dev/null}" 2>&1
+        ;;
+
+      auto) cat <<EOS
+{ if [ "\$ZSH_VERSION" ] && compctl; then # zsh
+    eval "\$(fasd --init posix-alias zsh-hook zsh-ccomp zsh-ccomp-install \\
+      zsh-wcomp zsh-wcomp-install)"
+  elif [ "\$BASH_VERSION" ] && complete; then # bash
+    eval "\$(fasd --init posix-alias bash-hook bash-ccomp bash-ccomp-install)"
+  else # posix shell
+    eval "\$(fasd --init posix-alias posix-hook)"
+  fi
+} >> "$_FASD_SINK" 2>&1
+
+EOS
+        ;;
+
+      posix-alias) cat <<EOS
+alias a='fasd -a'
+alias s='fasd -si'
+alias sd='fasd -sid'
+alias sf='fasd -sif'
+alias d='fasd -d'
+alias f='fasd -f'
+# function to execute built-in cd
+fasd_cd() {
+  if [ \$# -le 1 ]; then
+    fasd "\$@"
+  else
+    local _fasd_ret="\$(fasd -e 'printf %s' "\$@")"
+    [ -z "\$_fasd_ret" ] && return 1
+    [ -d "\$_fasd_ret" ] && cd "\$_fasd_ret" || printf '%s\\n' "\$_fasd_ret"
+  fi
+}
+alias z='fasd_cd -d'
+alias zz='fasd_cd -d -i'
+
+EOS
+        ;;
+
+      tcsh-alias) cat <<EOS
+alias a 'fasd -a';
+alias s 'fasd -si';
+alias sd 'fasd -sid';
+alias sf 'fasd -sif';
+alias d 'fasd -d';
+alias f 'fasd -f';
+alias z 'cd "\`fasd -d -e printf\\ %s \\!*\`" >& /dev/null || fasd -d';
+EOS
+        ;;
+
+      zsh-hook) cat <<EOS
+# add zsh hook
+_fasd_preexec() {
+  { fasd --proc \$(fasd --sanitize "\$2") } >> "$_FASD_SINK" 2>&1
+}
+autoload -Uz add-zsh-hook
+add-zsh-hook preexec _fasd_preexec
+
+EOS
+        ;;
+
+      bash-hook) cat <<EOS
+_fasd_prompt_func() {
+  local _exit_code="\$?"
+  eval "fasd --proc \$(fasd --sanitize \$(history 1 | \\
+    sed "s/^[ ]*[0-9]*[ ]*//"))" >> "$_FASD_SINK" 2>&1
+  # preserve exit code
+  return \$_exit_code
+}
+
+# add bash hook
+case \$PROMPT_COMMAND in
+  *_fasd_prompt_func*) ;;
+  *) PROMPT_COMMAND="_fasd_prompt_func;\$PROMPT_COMMAND";;
+esac
+
+EOS
+        ;;
+
+      posix-hook) cat <<EOS
+_fasd_ps1_func() {
+  { eval "fasd --proc \$(fasd --sanitize \$(fc -nl -1))"; } \\
+    >> "$_FASD_SINK" 2>&1
+}
+case \$PS1 in
+  *_fasd_ps1_func*) ;;
+  *) export PS1="\\\$(_fasd_ps1_func)\$PS1";;
+esac
+
+EOS
+        ;;
+
+      tcsh-hook) cat <<EOS
+alias fasd-prev-cmd 'fasd --sanitize \`history -h 1\`';
+alias precmd 'eval "fasd --proc \`fasd-prev-cmd\`" >& /dev/null';
+EOS
+
+        ;;
+
+      zsh-ccomp) cat <<EOS
+# zsh command mode completion
+_fasd_zsh_cmd_complete() {
+  local compl
+  read -c compl
+  (( \$+compstate )) && compstate[insert]=menu # no expand if compsys loaded
+  reply=(\${(f)"\$(fasd --complete "\$compl")"})
+}
+
+EOS
+        ;;
+
+      zsh-wcomp) cat <<EOS
+(( \$+functions[compdef] )) && {
+  # zsh word mode completion
+  _fasd_zsh_word_complete() {
+    [ "\$2" ] && local _fasd_cur="\$2"
+    [ -z "\$_fasd_cur" ] && local _fasd_cur="\${words[CURRENT]}"
+    local fnd="\${_fasd_cur//,/ }"
+    local typ=\${1:-e}
+    fasd --query \$typ "\$fnd" 2>> "$_FASD_SINK" | \\
+      sort -nr | sed 's/^[^ ]*[ ]*//' | while read -r line; do
+        compadd -U -V fasd "\$line"
+      done
+    compstate[insert]=menu # no expand
+  }
+  _fasd_zsh_word_complete_f() { _fasd_zsh_word_complete f ; }
+  _fasd_zsh_word_complete_d() { _fasd_zsh_word_complete d ; }
+  _fasd_zsh_word_complete_trigger() {
+    local _fasd_cur="\${words[CURRENT]}"
+    eval \$(fasd --word-complete-trigger _fasd_zsh_word_complete \$_fasd_cur)
+  }
+  # define zle widgets
+  zle -C fasd-complete complete-word _generic
+  zstyle ':completion:fasd-complete:*' completer _fasd_zsh_word_complete
+  zstyle ':completion:fasd-complete:*' menu-select
+
+  zle -C fasd-complete-f complete-word _generic
+  zstyle ':completion:fasd-complete-f:*' completer _fasd_zsh_word_complete_f
+  zstyle ':completion:fasd-complete-f:*' menu-select
+
+  zle -C fasd-complete-d complete-word _generic
+  zstyle ':completion:fasd-complete-d:*' completer _fasd_zsh_word_complete_d
+  zstyle ':completion:fasd-complete-d:*' menu-select
+}
+
+EOS
+        ;;
+
+      zsh-ccomp-install) cat <<EOS
+# enable command mode completion
+compctl -U -K _fasd_zsh_cmd_complete -V fasd -x 'C[-1,-*e],s[-]n[1,e]' -c - \\
+  'c[-1,-A][-1,-D]' -f -- fasd fasd_cd
+
+EOS
+        ;;
+
+      zsh-wcomp-install) cat <<EOS
+(( \$+functions[compdef] )) && {
+  # enable word mode completion
+  orig_comp="\$(zstyle -L ':completion:\\*' completer 2>> "$_FASD_SINK")"
+  if [ "\$orig_comp" ]; then
+    case \$orig_comp in
+      *_fasd_zsh_word_complete_trigger*);;
+      *) eval "\$orig_comp _fasd_zsh_word_complete_trigger";;
+    esac
+  else
+    zstyle ':completion:*' completer _complete _fasd_zsh_word_complete_trigger
+  fi
+  unset orig_comp
+}
+
+EOS
+        ;;
+
+      bash-ccomp) cat <<EOS
+# bash command mode completion
+_fasd_bash_cmd_complete() {
+  # complete command after "-e"
+  local cur=\${COMP_WORDS[COMP_CWORD]}
+  [[ \${COMP_WORDS[COMP_CWORD-1]} == -*e ]] && \\
+    COMPREPLY=( \$(compgen -A command \$cur) ) && return
+  # complete using default readline complete after "-A" or "-D"
+  case \${COMP_WORDS[COMP_CWORD-1]} in
+    -A|-D) COMPREPLY=( \$(compgen -o default \$cur) ) && return;;
+  esac
+  # get completion results using expanded aliases
+  local RESULT=\$( fasd --complete "\$(alias -p \$COMP_WORDS \\
+    2>> "$_FASD_SINK" | sed -n "\\\$s/^.*'\\\\(.*\\\\)'/\\\\1/p")
+    \${COMP_LINE#* }" | while read -r line; do
+      quote_readline "\$line" 2>/dev/null || \\
+        printf %q "\$line" 2>/dev/null  && \\
+        printf \\\\n
+    done)
+  local IFS=\$'\\n'; COMPREPLY=( \$RESULT )
+}
+_fasd_bash_hook_cmd_complete() {
+  for cmd in \$*; do
+    complete -F _fasd_bash_cmd_complete \$cmd
+  done
+}
+
+EOS
+        ;;
+
+      bash-ccomp-install) cat <<EOS
+# enable bash command mode completion
+_fasd_bash_hook_cmd_complete fasd a s d f sd sf z zz
+
+EOS
+        ;;
+      esac; shift
+    done
+    ;;
+
+  # if "$_fasd_cur" or "$2" is a query, then output shell code to be eval'd
+  --word-complete-trigger)
+    shift; [ "$2" ] && local _fasd_cur="$2" || return
+    case $_fasd_cur in
+      ,*) printf %s\\n "$1 e $_fasd_cur";;
+      f,*) printf %s\\n "$1 f ${_fasd_cur#?}";;
+      d,*) printf %s\\n "$1 d ${_fasd_cur#?}";;
+      *,,) printf %s\\n "$1 e $_fasd_cur";;
+      *,,f) printf %s\\n "$1 f ${_fasd_cur%?}";;
+      *,,d) printf %s\\n "$1 d ${_fasd_cur%?}";;
+    esac
+    ;;
+
+  --sanitize) shift; printf %s\\n "$*" | \
+      sed 's/\([^\]\)$( *[^ ]* *\([^)]*\)))*/\1\2/g
+        s/\([^\]\)[|&;<>$`{}]\{1,\}/\1 /g'
+    ;;
+
+  --proc) shift # process commands
+    # stop if we don't own $_FASD_DATA or $_FASD_RO is set
+    [ -f "$_FASD_DATA" -a ! -O "$_FASD_DATA" ] || [ "$_FASD_RO" ] && return
+
+    # blacklists
+    local each; for each in $_FASD_BLACKLIST; do
+      case " $* " in *\ $each\ *) return;; esac
+    done
+
+    # shifts
+    while true; do
+      case " $_FASD_SHIFT " in
+        *\ $1\ *) shift;;
+        *) break;;
+      esac
+    done
+
+    # ignores
+    case " $_FASD_IGNORE " in
+      *\ $1\ *) return;;
+    esac
+
+    shift; fasd --add "$@" # add all arguments except command
+    ;;
+
+  --add|-A) shift # add entries
+    # stop if we don't own $_FASD_DATA or $_FASD_RO is set
+    [ -f "$_FASD_DATA" -a ! -O "$_FASD_DATA" ] || [ "$_FASD_RO" ] && return
+
+    # find all valid path arguments, convert them to simplest absolute form
+    local paths="$(while [ "$1" ]; do
+      [ -e "$1" ] && printf %s\\n "$1"; shift
+    done | sed '/^[^/]/s@^@'"$PWD"'/@
+      s@/\.\.$@/../@;s@/\(\./\)\{1,\}@/@g;:0
+      s@[^/][^/]*//*\.\./@/@;t 0
+      s@^/*\.\./@/@;s@//*@/@g;s@/\.\{0,1\}$@@;s@^$@/@' 2>> "$_FASD_SINK" \
+      | ( [ $_FASD_RESOLVE_SYMLINKS = 1 ] && xargs -I {} readlink -f {} || cat ) \
+      | tr '\n' '|')"
+
+    # add current pwd if the option is set
+    local pwd="$PWD"
+    [ $_FASD_RESOLVE_SYMLINKS = 1 ] && pwd="$(readlink -f "$pwd")"
+    [ $_FASD_ONLY_VCS = 1 ] && pwd="$(get_vcs $pwd)"
+    [ "$_FASD_TRACK_PWD" = 1 -a "$PWD" != "$HOME" ] && paths="$paths|$pwd"
+
+    [ -z "${paths##\|}" ] && return # stop if we have nothing to add
+
+    # maintain the file
+    local tempfile
+    tempfile="$(mktemp "$_FASD_DATA".XXXXXX)" || return
+    $_FASD_AWK -v list="$paths" -v now="$(date +%s)" -v max="$_FASD_MAX" -F"|" '
+      BEGIN {
+        split(list, files, "|")
+        for(i in files) {
+          path = files[i]
+          if(path == "") continue
+          paths[path] = path # array for checking
+          rank[path] = 1
+          time[path] = now
+        }
+      }
+      $2 >= 1 {
+        if($1 in paths) {
+          rank[$1] = $2 + 1 / $2
+          time[$1] = now
+        } else {
+          rank[$1] = $2
+          time[$1] = $3
+        }
+        count += $2
+      }
+      END {
+        if(count > max)
+          for(i in rank) print i "|" 0.9*rank[i] "|" time[i] # aging
+        else
+          for(i in rank) print i "|" rank[i] "|" time[i]
+      }' "$_FASD_DATA" 2>> "$_FASD_SINK" >| "$tempfile"
+    if [ $? -ne 0 -a -f "$_FASD_DATA" ]; then
+      env rm -f "$tempfile"
+    else
+      env mv -f "$tempfile" "$_FASD_DATA"
+    fi
+    ;;
+
+  --delete|-D) shift # delete entries
+    # stop if we don't own $_FASD_DATA or $_FASD_RO is set
+    [ -f "$_FASD_DATA" -a ! -O "$_FASD_DATA" ] || [ "$_FASD_RO" ] && return
+
+    # turn valid arguments into entry-deleting sed commands
+    local sed_cmd="$(while [ "$1" ]; do printf %s\\n "$1"; shift; done | \
+      sed '/^[^/]/s@^@'"$PWD"'/@;s@/\.\.$@/../@;s@/\(\./\)\{1,\}@/@g;:0
+        s@[^/][^/]*//*\.\./@/@;t 0
+        s@^/*\.\./@/@;s@//*@/@g;s@/\.\{0,1\}$@@
+        s@^$@/@;s@\([.[\/*^$]\)@\\\1@g;s@^\(.*\)$@/^\1|/d@' 2>> "$_FASD_SINK")"
+
+    # maintain the file
+    local tempfile
+    tempfile="$(mktemp "$_FASD_DATA".XXXXXX)" || return
+
+    sed "$sed_cmd" "$_FASD_DATA" 2>> "$_FASD_SINK" >| "$tempfile"
+
+    if [ $? -ne 0 -a -f "$_FASD_DATA" ]; then
+      env rm -f "$tempfile"
+    else
+      env mv -f "$tempfile" "$_FASD_DATA"
+    fi
+    ;;
+
+  --query) shift # query the db, --query [$typ ["$fnd" [$mode]]]
+    [ -f "$_FASD_DATA" ] || return # no db yet
+    [ "$1" ] && local typ="$1"
+    [ "$2" ] && local fnd="$2"
+    [ "$3" ] && local mode="$3"
+
+    # cat all backends
+    local each _fasd_data; for each in $_FASD_BACKENDS; do
+      _fasd_data="$_fasd_data
+$(fasd --backend $each)"
+    done
+    [ "$_fasd_data" ] || _fasd_data="$(cat "$_FASD_DATA")"
+
+    # set mode specific code for calculating the prior
+    case $mode in
+      rank) local prior='times[i]';;
+      recent) local prior='sqrt(100000/(1+t-la[i]))';;
+      *) local prior='times[i] * frecent(la[i])';;
+    esac
+
+    if [ "$fnd" ]; then # default matching
+      local bre="$(printf %s\\n "$fnd" | sed 's/\([*\.\\\[]\)/\\\1/g
+        s@ @[^|]*@g;s/\$$/|/')"
+      bre='^[^|]*'"$bre"'[^|/]*|'
+      local _ret="$(printf %s\\n "$_fasd_data" | $_FASD_GREP "$bre")"
+      # force no case matching for default matching
+      [ "$_FASD_NOCASE" = 1 ] && _ret="$(printf %s\\n "$_fasd_data" | grep -i "$bre")"
+      [ "$_ret" ] && _ret="$(printf %s\\n "$_ret" | while read -r line; do
+        [ -${typ:-e} "${line%%\|*}" ] && printf %s\\n "$line"
+      done)"
+      if [ "$_ret" ]; then
+        _fasd_data="$_ret"
+      else # no case matching
+        _ret="$(printf %s\\n "$_fasd_data" | $_FASD_GREP -i "$bre")"
+        [ "$_ret" ] && _ret="$(printf %s\\n "$_ret" | while read -r line; do
+          [ -${typ:-e} "${line%%\|*}" ] && printf %s\\n "$line"
+        done)"
+        if [ "$_ret" ]; then
+          _fasd_data="$_ret"
+        elif [ "${_FASD_FUZZY:-0}" -gt 0 ]; then # fuzzy matching
+          local fuzzy_bre="$(printf %s\\n "$fnd" | \
+            sed 's/\([*\.\\\[]\)/\\\1/g;s/\$$/|/
+              s@\(\\\{0,1\}[^ ]\)@\1[^|/]\\{0,'"$_FASD_FUZZY"'\\}@g
+              s@ @[^|]*@g')"
+          fuzzy_bre='^[^|]*'"$fuzzy_bre"'[^|/]*|'
+          _ret="$(printf %s\\n "$_fasd_data" | $_FASD_GREP -i "$fuzzy_bre")"
+          [ "$_ret" ] && _ret="$(printf %s\\n "$_ret" | while read -r line; do
+            [ -${typ:-e} "${line%%\|*}" ] && printf %s\\n "$line"
+          done)"
+          [ "$_ret" ] && _fasd_data="$_ret" || _fasd_data=
+        fi
+      fi
+    else # no query arugments
+      _fasd_data="$(printf %s\\n "$_fasd_data" | while read -r line; do
+        [ -${typ:-e} "${line%%\|*}" ] && printf %s\\n "$line"
+      done)"
+    fi
+
+    # query the database
+    [ "$_fasd_data" ] && printf %s\\n "$_fasd_data" | \
+      $_FASD_AWK -v t="$(date +%s)" -F"|" '
+      function frecent(time) {
+        dx = t-time
+        if( dx < 3600 ) return 6
+        if( dx < 86400 ) return 4
+        if( dx < 604800 ) return 2
+        return 1
+      }
+      {
+        if(!paths[$1]) {
+          times[$1] = $2
+          la[$1] = $3
+          paths[$1] = 1
+        } else {
+          times[$1] += $2
+          if($3 > la[$1]) la[$1] = $3
+        }
+      }
+      END {
+        for(i in paths) printf "%-10s %s\n", '"$prior"', i
+      }' - 2>> "$_FASD_SINK"
+    ;;
+
+  --backend)
+    case $2 in
+      native) cat "$_FASD_DATA";;
+      viminfo)
+        < "$_FASD_VIMINFO" sed -n '/^>/{s@~@'"$HOME"'@
+          s/^..//
+          p
+          }' | $_FASD_AWK -v t="$(date +%s)" '{
+            t -= 60
+            print $0 "|1|" t
+          }'
+        ;;
+      recently-used)
+        local nl="$(printf '\\\nX')"; nl="${nl%X}" # slash newline for sed
+        tr -d '\n' < "$_FASD_RECENTLY_USED_XBEL" | \
+          sed 's@file:/@'"$nl"'@g;s@count="@'"$nl"'@g' | sed '1d;s/".*$//' | \
+          tr '\n' '|' | sed 's@|/@'"$nl"'@g' | $_FASD_AWK -F'|' '{
+            sum = 0
+            for( i=2; i<=NF; i++ ) sum += $i
+            print $1 "|" sum
+          }'
+        ;;
+      current)
+        for path in *; do
+          printf "$PWD/%s|1\\n" "$path"
+        done
+        ;;
+      spotlight)
+        mdfind '(kMDItemFSContentChangeDate >= $time.today) ||
+          kMDItemLastUsedDate >= $time.this_month' \
+          | sed '/Library\//d
+            /\.app$/d
+            s/$/|2/'
+        ;;
+      *) eval "$2";;
+    esac
+    ;;
+
+  *) # parsing logic and processing
+    local fnd= last= _FASD_BACKENDS="$_FASD_BACKENDS" _fasd_data= comp= exec=
+    while [ "$1" ]; do case $1 in
+      --complete) [ "$2" = "--" ] && shift; set -- $2; local lst=1 r=r comp=1;;
+      --query|--add|--delete|-A|-D) fasd "$@"; return $?;;
+      --version) [ -z "$comp" ] && echo "1.0.2" && return;;
+      --) while [ "$2" ]; do shift; fnd="$fnd $1"; last="$1"; done;;
+      -*) local o="${1#-}"; while [ "$o" ]; do case $o in
+          s*) local show=1;;
+          l*) local lst=1;;
+          i*) [ -z "$comp" ] && local interactive=1 show=1;;
+          r*) local mode=rank;;
+          t*) local mode=recent;;
+          e*) o="${o#?}"; if [ "$o" ]; then # there are characters after "-e"
+                local exec="$o" # anything after "-e"
+              else # use the next argument
+                local exec="${2:?"-e: Argument needed "}"
+                shift
+              fi; break;;
+          b*) o="${o#?}"; if [ "$o" ]; then
+                _FASD_BACKENDS="$o"
+              else
+                _FASD_BACKENDS="${2:?"-b: Argument needed"}"
+                shift
+              fi; break;;
+          B*) o="${o#?}"; if [ "$o" ]; then
+                _FASD_BACKENDS="$_FASD_BACKENDS $o"
+              else
+                _FASD_BACKENDS="$_FASD_BACKENDS ${2:?"-B: Argument needed"}"
+                shift
+              fi; break;;
+          a*) local typ=e;;
+          d*) local typ=d;;
+          f*) local typ=f;;
+          R*) local r=r;;
+      [0-9]*) local _fasd_i="$o"; break;;
+          h*) [ -z "$comp" ] && echo "fasd [options] [query ...]
+[f|a|s|d|z] [options] [query ...]
+  options:
+    -s         list paths with scores
+    -l         list paths without scores
+    -i         interactive mode
+    -e <cmd>   set command to execute on the result file
+    -b <name>  only use <name> backend
+    -B <name>  add additional backend <name>
+    -a         match files and directories
+    -d         match directories only
+    -f         match files only
+    -r         match by rank only
+    -t         match by recent access only
+    -R         reverse listing order
+    -h         show a brief help message
+    -[0-9]     select the nth entry
+
+fasd [-A|-D] [paths ...]
+    -A    add paths
+    -D    delete paths" >&2 && return;;
+        esac; o="${o#?}"; done;;
+      *) fnd="$fnd $1"; last="$1";;
+    esac; shift; done
+
+    # guess whether the last query is selected from tab completion
+    case $last in
+      /?*) if [ -z "$show$lst" -a -${typ:-e} "$last" -a "$exec" ]; then
+             $exec "$last"
+             return
+           fi;;
+    esac
+
+    local R; [ -z "$r" ] && R=r || R= # let $R be the opposite of $r
+    fnd="${fnd# }"
+
+    local res
+    res="$(fasd --query 2>> "$_FASD_SINK")" # query the database
+    [ $? -gt 0 ] && return
+    if [ 0 -lt ${_fasd_i:-0} ] 2>> "$_FASD_SINK"; then
+      res="$(printf %s\\n "$res" | sort -n${R} | \
+        sed -n "$_fasd_i"'s/^[^ ]*[ ]*//p')"
+    elif [ "$interactive" ] || [ "$exec" -a -z "$fnd$lst$show" -a -t 1 ]; then
+      if [ "$(printf %s "$res" | sed -n '$=')" -gt 1 ]; then
+        res="$(printf %s\\n "$res" | sort -n${R})"
+        printf %s\\n "$res" | sed = | sed 'N;s/\n/	/' | sort -nr >&2
+        printf "> " >&2
+        local i; read i; [ 0 -lt "${i:-0}" ] 2>> "$_FASD_SINK" || return 1
+      fi
+      res="$(printf %s\\n "$res" | sed -n "${i:-1}"'s/^[^ ]*[ ]*//p')"
+    elif [ "$lst" ]; then
+      [ "$res" ] && printf %s\\n "$res" | sort -n${r} | sed 's/^[^ ]*[ ]*//'
+      return
+    elif [ "$show" ]; then
+      [ "$res" ] && printf %s\\n "$res" | sort -n${r}
+      return
+    elif [ "$fnd" ] && [ "$exec" -o ! -t 1 ]; then # exec or subshell
+      res="$(printf %s\\n "$res" | sort -n | sed -n '$s/^[^ ]*[ ]*//p')"
+    else # no args, show
+      [ "$res" ] && printf %s\\n "$res" | sort -n${r}
+      return
+    fi
+    if [ "$res" ]; then
+      fasd --add "$res"
+      [ -z "$exec" ] && exec='printf %s\n'
+      exec $exec "$res"
+    fi
+    ;;
+  esac
+}
+
+fasd --init env
+
+case $- in
+  *i*) ;; # assume being sourced, do nothing
+  *) # assume being executed as an executable
+    if [ -x "$_FASD_SHELL" -a -z "$_FASD_SET" ]; then
+      _FASD_SET=1 exec $_FASD_SHELL "$0" "$@"
+    else
+      fasd "$@"
+    fi;;
+esac