title: -bash: export: `=': not a valid identifier
body: <p>Every time I open my terminal I get the error below:</p>
  
  <pre><code>Last login: Sun Aug  4 17:23:05 on ttys000
  -bash: export: `=': not a valid identifier
  -bash: export: `/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/mysql/bin': not a valid identifier
  -bash: export: `=': not a valid identifier
  -bash: export: `/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/mysql/bin': not a valid identifier
  </code></pre>
  
  <p>And here is my <code>export</code> output:</p>
  
  <pre><code>Calvin:~ sunkehappy$ export
  declare -x Apple_PubSub_Socket_Render="/tmp/launch-4lEZNa/Render"
  declare -x Apple_Ubiquity_Message="/tmp/launch-ukGAv5/Apple_Ubiquity_Message"
  declare -x COMMAND_MODE="unix2003"
  declare -x HOME="/Users/sunkehappy"
  declare -x LANG="zh_CN.UTF-8"
  declare -x LOGNAME="sunkehappy"
  declare -x OLDPWD
  declare -x PATH="/opt/local/bin:/opt/local/sbin:/opt/local/bin:/opt/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin"
  declare -x PWD="/Users/sunkehappy"
  declare -x SECURITYSESSIONID="186a4"
  declare -x SHELL="/bin/bash"
  declare -x SHLVL="1"
  declare -x SSH_AUTH_SOCK="/tmp/launch-YAEryC/Listeners"
  declare -x TERM="xterm-256color"
  declare -x TERM_PROGRAM="Apple_Terminal"
  declare -x TERM_PROGRAM_VERSION="309"
  declare -x TERM_SESSION_ID="B134A404-D87F-4BB9-8A08-55F8CE923339"
  declare -x TMPDIR="/var/folders/kt/pfw99tps22gg2019vz8k1zcm0000gn/T/"
  declare -x USER="sunkehappy"
  declare -x __CF_USER_TEXT_ENCODING="0x1F5:25:52"
  </code></pre>