Не может экспортировать переменную благодаря сценарию с zsh

Я записал сценарий export-zsh установить новые переменные в zsh

$ cat export-zsh
#!/bin/bash
echo "export $@">> /root/.zshrc
source /root/.zshrc

Ошибки происходят, если я выполняю его

$export-zsh "a=2"
/root/.zshrc: line 12: setopt: command not found
/root/.zshrc: line 33: bindkey: command not found
/root/.zshrc: line 36: bindkey: command not found
[...]
/root/.zshrc: line 42: modload: command not found
[...]

Когда я выполняю каждую команду индивидуально, она не приводит ни к каким ошибкам:

$ echo "export a=2">> /root/.zshrc; source /root/.zshrc
$ [ NO ERROR ]

когда я работаю source ~/.zshrc, нет никаких ошибок, таким образом, я не думаю, что это должно быть непосредственно связано с моим ~/.zshrc содержание, но я даю его ниже, чтобы быть уверенным.

PS:

export PYTHONSTARTUP="/home/$USER/Dropbox/.pythonrc"
export SHELL=/bin/zsh
# File:     .zshrc   ZSH resource file                             #
# Version:  0.1.16                                                 #
# Author:   Øyvind "Mr.Elendig" Heggstad <mrelendig@har-ikkje.net> #
#------------------------------------------------------------------#
#------------------------------

# History stuff
#------------------------------
#setopt hist_ignore_all_dups
setopt APPEND_HISTORY
HISTSIZE=9999999999999999
HISTFILE="/home/nbougach/Dropbox/.histfile"
#setopt EXTENDED_HISTORY
#------------------------------
# Variables
#------------------------------
export BROWSER="chromium-browser"
export EDITOR="vim"
#export PAGER="vimpager"
export PATH="${PATH}:${HOME}/bin:${HOME}/.cabal/bin:/usr/local/sbin:/usr/sbin:/sbin"
#source ~/.b
#-----------------------------
# Dircolors
#-----------------------------
#LS_COLORS='rs=0:di=01;34:ln=01;36:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:tw=30;42:ow=34;42:st=37;44:ex=01;32:';
export LS_COLORS

#------------------------------
# Keybindings
#------------------------------
bindkey -v
typeset -g -A key
#bindkey '\e[3~' delete-char
bindkey '\e[1~' beginning-of-line
bindkey '\e[4~' end-of-line
#bindkey '\e[2~' overwrite-mode
bindkey '^?' backward-delete-char
bindkey '^[[1~' beginning-of-line
bindkey '^[[5~' up-line-or-history
bindkey '^[[3~' delete-char
bindkey '^[[4~' end-of-line
bindkey '^[[6~' down-line-or-history
bindkey '^[[A' up-line-or-search
bindkey '^[[D' backward-char
bindkey '^[[B' down-line-or-search
bindkey '^[[C' forward-char 
# for rxvt
bindkey "\e[8~" end-of-line
bindkey "\e[7~" beginning-of-line
# for gnome-terminal
bindkey "\eOH" beginning-of-line
bindkey "\eOF" end-of-line

#------------------------------
# Alias stuff
#------------------------------
alias ls="ls --color -F"
alias ll="ls --color -lh"
alias spm="sudo pacman"
alias spmc="sudo pacman-color"
alias gr="gvim --remote-silent"
alias vr="vim --remote-silent"

#------------------------------
# ShellFuncs
#------------------------------
# -- coloured manuals
man() {
  env \
    LESS_TERMCAP_mb=$(printf "\e[1;31m") \
    LESS_TERMCAP_md=$(printf "\e[1;31m") \
    LESS_TERMCAP_me=$(printf "\e[0m") \
    LESS_TERMCAP_se=$(printf "\e[0m") \
    LESS_TERMCAP_so=$(printf "\e[1;44;33m") \
    LESS_TERMCAP_ue=$(printf "\e[0m") \
    LESS_TERMCAP_us=$(printf "\e[1;32m") \
    man "$@"
}

#------------------------------
# Comp stuff
#------------------------------
zmodload zsh/complist 
#autoload -Uz compinit
#compinit
zstyle :compinstall filename '${HOME}/.zshrc'

#- buggy
zstyle ':completion:*:descriptions' format '%U%B%d%b%u'
zstyle ':completion:*:warnings' format '%BSorry, no matches for: %d%b'
#-/buggy

zstyle ':completion:*:pacman:*' force-list always
zstyle ':completion:*:*:pacman:*' menu yes select

#zstyle ':completion:*:default' list-colors ${(s.:.)LS_COLORS}

zstyle ':completion:*:*:kill:*' menu yes select
zstyle ':completion:*:kill:*'   force-list always

zstyle ':completion:*:*:killall:*' menu yes select
zstyle ':completion:*:killall:*'   force-list always

#- complete pacman-color the same as pacman
compdef _pacman pacman-color=pacman

#------------------------------
# Window title
#------------------------------
case $TERM in
  termite|*xterm*|rxvt|rxvt-unicode|rxvt-256color|rxvt-unicode-256color|(dt|k|E)term)
    precmd () {
      vcs_info
      print -Pn "\e]0;[%n@%M][%~]%#\a"
    } 
    preexec () { print -Pn "\e]0;[%n@%M][%~]%# ($1)\a" }
    ;;
  screen|screen-256color)
    precmd () { 
      vcs_info
      print -Pn "\e]83;title \"$1\"\a" 
      print -Pn "\e]0;$TERM - (%L) [%n@%M]%# [%~]\a" 
    }
    preexec () { 
      print -Pn "\e]83;title \"$1\"\a" 
      print -Pn "\e]0;$TERM - (%L) [%n@%M]%# [%~] ($1)\a" 
    }
    ;; 
esac

#------------------------------
# Prompt
#------------------------------
autoload -U colors zsh/terminfo
colors

autoload -Uz vcs_info
zstyle ':vcs_info:*' enable git hg
zstyle ':vcs_info:*' check-for-changes true
zstyle ':vcs_info:git*' formats "%{${fg[cyan]}%}[%{${fg[green]}%}%s%{${fg[cyan]}%}][%{${fg[blue]}%}%r/%S%%{${fg[cyan]}%}][%{${fg[blue]}%}%b%{${fg[yellow]}%}%m%u%c%{${fg[cyan]}%}]%{$reset_color%}"

setprompt() {
  # load some modules
  setopt prompt_subst

  # make some aliases for the colours: (coud use normal escap.seq's too)
  for color in RED GREEN YELLOW BLUE MAGENTA CYAN WHITE; do
    eval PR_$color='%{$fg[${(L)color}]%}'
  done
  PR_NO_COLOR="%{$terminfo[sgr0]%}"

  # Check the UID
  if [[ $UID -ge 1000 ]]; then # normal user
    eval PR_USER='${PR_GREEN}%n${PR_NO_COLOR}'
    eval PR_USER_OP='${PR_GREEN}%#${PR_NO_COLOR}'
  elif [[ $UID -eq 0 ]]; then # root
    eval PR_USER='${PR_RED}%n${PR_NO_COLOR}'
    eval PR_USER_OP='${PR_RED}%#${PR_NO_COLOR}'
  fi

  # Check if we are on SSH or not
  if [[ -n "$SSH_CLIENT"  ||  -n "$SSH2_CLIENT" ]]; then 
    eval PR_HOST='${PR_YELLOW}%M${PR_NO_COLOR}' #SSH
  else 
    eval PR_HOST='${PR_GREEN}%M${PR_NO_COLOR}' # no SSH
  fi
  # set the prompt
  PS1=$'${PR_CYAN}[${PR_USER}${PR_CYAN}@${PR_HOST}${PR_CYAN}][${PR_BLUE}%~${PR_CYAN}]${PR_USER_OP} '
  PS2=$'%_>'
  RPROMPT=$'${vcs_info_msg_0_}'
}
setprompt

# vim: set ts=2 sw=2 et:
#source ~/.b
setopt HIST_NO_FUNCTIONS

setopt HIST_SAVE_NO_DUPS

setopt INC_APPEND_HISTORY