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I have an odd problem with zsh when I switch between shells in a particular way:

Option 1 (works well):

I start a zsh shell. I switch to tcsh with /bin/tcsh, and I switch back to zsh with /bin/zsh

If I then run:

> ls

I get:

./  ../ file1 file1 file3

Option 2 (problematic):

I start a zsh shell. I switch to tcsh with:

exec env -i HOME=$HOME TERM=$TERM DISPLAY=$DISPLAY /bin/tcsh.

and I then switch back to zsh with /bin/zsh. If I then enter any commands, the zsh shell echoes the command and then the result. Using the same example as before:

> ls

2;ls --color=yes -aF1;./ ../ file1 file2 file3

In other words, zsh shows 2;COMMAND 1; and then the output, which is of course very different from what I was getting with Option 1.

What's even more strange is that this only happens within ansi-term or multi-term terminals in Emacs, and not under gnome-terminal.

What else can I do to diagnose the problem? Any thoughts on what may be causing this?

Update:

My .cshrc prompt is

set prompt = "> "
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1  
Escape code to update the title of your terminal –  Ulrich Dangel May 5 '13 at 8:17
    
what is $prompt set to in tcsh? Do tcsh -V and zsh -x give a clue? –  Stéphane Chazelas May 5 '13 at 13:36
    
Thanks @UlrichDangel. What do you mean by that? –  user815423426 May 5 '13 at 21:40
    
Thanks @StephaneChazelas. I updated the OP with prompt info. Is there anything in particular that you recommend I pay attention to in the trace? –  user815423426 May 5 '13 at 21:47
1  
@user815423426 something tries to update the title of your terminal to show the command you are running. as probably neither ansi-term nor multi-term terminal supports this they just show the escape codes instead of updating the title –  Ulrich Dangel May 6 '13 at 12:35

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