RE: system command takes a different environment variable from current shell?

I thought this was pretty clear :-): And here are the steps again:

1) xterm with a login tcsh shell is created. At this time $c is set to /volume/current.
2) do " setenv c /volumeNew/current". As this time "echo $c" in this shell shows new value;
3) under vim, ":echo $c" shows new value;
4) under vim, ":let x = system("echo $c")", and then ":echo $c" shows old value.

--Karl

-----Original Message-----
From: vim_use@googlegroups.com [mailto:vim_use@googlegroups.com] On Behalf Of Nikolay Pavlov
Sent: Monday, October 19, 2015 6:55 AM
To: vim_use@googlegroups.com
Subject: Re: system command takes a different environment variable from current shell?

2015-10-19 7:03 GMT+03:00 Karl (Xiangrong) Cai <xcai@juniper.net>:
> Regarding " What is your _exact_ set of steps that results in echo $c showing /volumeNEW/current"
>
> 641% echo $c
> /volume/current
> 642% setenv c /volumeNew/current
> 643% echo $c
> /volumeNew/current
>
> My vim is version 7.4. But is has same problem on 7.3.121 or 7.0.94. And I tried this on FreeBSD and Linux. Thanks.
> --Karl

You said "in vim, when I do "echo $c" it shows the new value "/volumeNEW/current", but when I use the above mentioned 2nd way".
"**In vim**", so these are *not* exact steps. And `643% echo $c` clearly suggests that you are doing this in shell.

You need to show literally *everything* what you type to see the error, after the first shell was launched. E.g.

setenv c /volumeNew/current
vim
:echo $c
:echo system('echo $c')

>
> -----Original Message-----
> From: vim_use@googlegroups.com [mailto:vim_use@googlegroups.com] On
> Behalf Of Random832
> Sent: Sunday, October 18, 2015 8:30 AM
> To: vim_use@googlegroups.com
> Subject: Re: system command takes a different environment variable from current shell?
>
> "Karl (Xiangrong) Cai" <xcai@juniper.net> writes:
>> And in vim, when I do 1) echo $c, and 2) let x = system("echo $c");
>> and then "echo x", both shows "/volume/current", which is expected;
>> Then inside this shell I set this variable to another value:
>> <<<
>> 603% setenv c /volumeNEW/current
>> 604% env | grep "SHELL\|current"
>> SHELL=tcsh
>> c=/volumeNEW/current
>> XTERM_SHELL=/bin/tcsh
>>>>>
>> And now in in vim, when I do "echo $c" it shows the new value
>> "/volumeNEW/current",
>
> That is very surprising, if you're not leaving anything out.
>
> How exactly did you set the variable? The only way to get back to the original shell without closing vim is to suspend vim (ctrl-z), but you didn't mention doing this. I suspended vim, did setenv, put vim back in foreground (fg), and echo $c showed the original value.
>
> What is your _exact_ set of steps that results in echo $c showing /volumeNEW/current ?
>
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