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

2015-10-19 16:49 GMT+03:00 Karl (Xiangrong) Cai <xcai@juniper.net>:
>
>
>>-----Original Message-----
>>From: vim_use@googlegroups.com [mailto:vim_use@googlegroups.com] On
>>Behalf Of Random832
>>Sent: Monday, October 19, 2015 9:14 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:
>>
>>> 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;
>>
>>Please provide _all_ the steps. According to these steps you haven't even started
>>vim. And are you doing the setenv to volumeNew within your original shell
>>(before starting vim?) or in a :! or system() call?
>>
>>Also, how is the old value set in the first place? Is it in your cshrc?
>
> [KCC] These are all the steps. First start the xterm and the tcsh, which as you said has $c set to old value in .cshrc. Then under the tcsh setenv $c to the new value. Then start vim and in vim do ":echo $c" which shows new value; and do ":let x = system("echo $c")", and then ":echo x" shows old value.

"Then start vim" was missing from the steps in your previous message.

If you ignored all replies but the very first mine you would already
have answer to your question: quick test shows that `tcsh -c` *does*
source `~/.tcshrc`. So `system("echo $c")` is "internally" like
`system('source ~/.tcshrc; echo $c')` which makes it obvious why $c
has "incorrect" value.

I have no `.cshrc`, but I do not think this makes a difference:
documentation says this is a fallback for .tcshrc.

You need to set &shellcmdflag to `-fc` to make tcsh not source its
configuration.

>
>>> 4) under vim, ":let x = system("echo $c")", and then ":echo $c" shows
>>> old value.
>>
>>Are you sure this is :echo $c or is it :echo x?
> [KCC] My bad. It is ":echo x", which shows old value.
> --Karl
>
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