I've been writing a function to run a command, extract the first word of
each line of the command's output and use that as a parameter to another
command. The command's output looks like this:

		1:/Citrix/Pres  WI
http://RA.eng.citrite.net/Citrix/Pres   4.5.5.1159
c:\inetpub\wwwroot\Citrix\Pres  
		1:/Citrix/Pres2 WI
http://RA.eng.citrite.net/Citrix/Pres2  4.5.5.1159
c:\inetpub\wwwroot\Citrix\Pres2 

After some trial-and-error I finally have the following function:

		SITEMGR=c:/Program\ Files/Citrix/Web\
Interface/4.5/sitemgr.exe
		delsites() {
		    for site in "${(f)$($SITEMGR -i)}" ; {
			sitepath=${${=site}[1]}
			[[ -n "$sitepath" ]] && $SITEMGR -r
"WICurrent=$sitepath"
		    }
		}

I'm new to the zsh parameter expansion flags, but I've gathered the
${(f) will take the command's output a line at a time, and the ${=site}
will then split each line into words, allowing me to grab the first word
of each line.

Is there a better (or simpler!) way to do this?  When the command has no
output, the `for' loop is still executed once (seemingly because the
command is within double-quotes) and is the reason for checking that the
length of $sitepath is non-zero. Is there a way to avoid the loop being
entered when the command has no output and avoid the need for this
check?

(btw, is there a good set of examples of using parameter expansion
flags? The zsh guide seemed a bit sparse in this area)

Thanks,

    --- John