install.sh: 12: [: unexpected operator

Ubuntu执行Shell脚本时提示错误:

root@MyLuoLuo:~/webapp/zcp-7.1.1-37812-ubuntu-12.04-i386# sh install.sh
install.sh: 12: [: unexpected operator

代码:

if [ ! -z "$1" -a "$1" == "-config" ]; then
        INSTALL=0

解决方法:

sudo dpkg-reconfigure dash  #选NO