Hi,

I had a solaris machine, when I run both putty and cygwin, it looks fine, I can start emacs, however, the shell is csh, I like bash, I run /bin/bash, the $DISPLAY looks fine, it show my IP properly, however, when I run emacs, it gave me some error message,

emacs: Cannot connect to X server localhost:0.0.
Check the DISPLAY environment variable or use `-d'.
Also use the `xhost' program to verify that it is set to permit
connections from your machine.

Maybe the variable's not exported? External applications wouldn't see it then, just the shell itself.

export DISPLAY
emacs

The DISPLAY has been set properly, and I type echo $DISPLAY to confirm it.

That does not confirm it's been set properly.

There are two kinds of shell variables -- environment variables, and local variables. Local variables aren't given to programs, but environment ones are.

To make sure a variable is an environment variable, do export VARIABLENAME

In this case, that would be export DISPLAY

export DISPLAY=localhost:0.0 is to set the DISPLAY, right? it is what I did.

peter

The display would be the name of the thing you want the thing you are displaying to go to. That would be attached to your computer, most likely in this case, the name of the computer your Cygwin is running on. But, to be honest, from your initial post, it's not at all clear what setup you have.

When I run emacs under csh, everything is ok, after I type '/bin/bash' switch to bash shell, I type 'export DISPLAY=localhost:0.0' and 'echo $DISPLAY' to confirm the DISPLAY has been set properly, however, when I run emacs, I got the error.