try this for a hint:
[ hello ] && echo yes
On Fri, 1 Jun 2012 13:58:20 +0800 Clark WANG wrote:
> For example:
> $ echo ${.sh.version}
> Version JMP 93u+ 2012-05-17
> $
> $ [ -n hello world ] && echo yes
> yes
> $
> In Bash I got:
> $ echo $BASH_VERSION
> 4.2.20(1)-release
> $
> $ [ -n hello world ] && echo yes
> bash: [: hello: binary operator expected
> $
> In Zsh I got:
> $ echo $ZSH_VERSION
> 4.3.12
> $
> $ [ -n hello world ] && echo yes
> [: too many arguments
> $
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