Does double quote makes any difference in setenv command in Linux csh?

Question

I am setting an environment variable - say ABC - in C shell in SuSe Linux.

My question, are there any difference in following 2 commands?

1. $setenv ABC "1"
2. $setenv ABC 1

In both the cases echo gave me the same result.

i.e

$echo $ABC 
1

For me, it looks to be both are same. But I wanted a confirmation to proceed.

Answer 1

No, there are no differences for your example. But csh is rightly considered harmful, so forget about it. Use bash or zsh instead.

^{My personal preference is to use Posix /bin/sh or else /bin/bash for scripts, and zsh as my interactive login shell}

Answer 2

In a nutshell if the value assigned to your environment variable include spaces you will need to use quotes.

Here's a link with more information about shell and environment variables. Search for the setenv on the page.