system command takes a different environment variable from current shell?

Hi,

I have a login tcsh which originally has this environment variable c set as “/volume/current”:

<<<

601% env | grep "SHELL\|current"

SHELL=tcsh

c=/volume/current

XTERM_SHELL=/bin/tcsh

>>>

 

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”, but when I use the above mentioned 2^nd way, it shows the old value “/volume/current”. Is it supposed to show the new value?

 

Am I wrong about how system() is supposed to pick up environment variable? Or there is a bug here?

 

Thanks.

--Karl