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Re: [[ -n $v ]] versus (( $#v > 0 ))

X-seq: zsh-users 12242
From: Dan Nelson <dnelson@xxxxxxxxxxxxxxx>
To: Nikolai Weibull <now@xxxxxxxx>
Subject: Re: [[ -n $v ]] versus (( $#v > 0 ))
Date: Tue, 20 Nov 2007 11:15:59 -0600
Cc: ZSH Users <zsh-users@xxxxxxxxxx>
In-reply-to: <dbfc82860711200445g19cd0177s1755ddfcfb246990@xxxxxxxxxxxxxx>
Mailing-list: contact zsh-users-help@xxxxxxxxxx; run by ezmlm
References: <dbfc82860711200445g19cd0177s1755ddfcfb246990@xxxxxxxxxxxxxx>

In the last episode (Nov 20), Nikolai Weibull said:
> What does the (imaginary) Zsh Scripting Style Guide say about
> 
> if [[ -n $v ]]; then
>   ...
> fi
> 
> versus
> 
> if (( $#v > 0 )); then
>   ...
> fi
> 
> Is it simply legacy that causes people to write [[ -n $v ]] over ((
> $#v > 0 ))?

You forgot [[ $#v -eq 0 ]]  :)

I like using (( $+v )) myself, since I usually want to know whether a
variable is set (even to "") or not. 

-- 
	Dan Nelson
	dnelson@xxxxxxxxxxxxxxx

References:
- [[ -n $v ]] versus (( $#v > 0 ))
  - From: Nikolai Weibull

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