== same as = in cygwin bash, not in linux bash?

[Tom Dorgan]

hello,

I recently backported some bash scripts developed on cygwin to linux.
to my surprise I got an interpretation error on a few of them. here's a
sample:
#!/bin/bash
if [ "$1" == "" ]; then
  while [ -z "$INSTALL_DOMAIN" ] ; do
      echo -n "Enter server web domain name: " ;
      read INSTALL_DOMAIN ;
  done
else
  INSTALL_DOMAIN="$1"
fi

this works on cygwin bash (latest fix) but gives:
t.sh: [: ==: binary operator expected 
on linux.

my Oreilly 'Learning the bash shell' book says that using == is a
common beginner mistake. I was wondering about this.....


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