Re: Expanding undefined variables within a shell

2011-09-17 Thread Jochen Spieker
Regid Ichira: > > Within a shell, what is the difference between [ -n undefinedString ] and [ > -n "$undefinedString" ] ? The interesting difference is between $undefinedString and "$undefinedString". The former resolves to literally nothing, not even an empty string. When you use qoutes, you g

Re: Expanding undefined variables within a shell

2011-09-17 Thread John L. Cunningham
On Sat, Sep 17, 2011 at 09:11:16AM -0700, Regid Ichira wrote: > Within a shell, what is the difference between [ -n undefinedString ] and [ > -n "$undefinedString" ] ? > With bash I get: > > $ unset undefinedString > $ [ -n undefinedString ] && printf "$undefinedString" | od -c >

Re: Expanding undefined variables within a shell

2011-09-17 Thread Claudius Hubig
Regid Ichira wrote: > Within a shell, what is the difference between [ -n undefinedString ] and [ > -n "$undefinedString" ] ? >With bash I get: > >$ unset undefinedString >$ [ -n undefinedString ] && printf "$undefinedString" | od -c >000 You are just testing for the length of

Expanding undefined variables within a shell

2011-09-17 Thread Regid Ichira
Within a shell, what is the difference between [ -n undefinedString ] and [ -n "$undefinedString" ] ? With bash I get: $ unset undefinedString $ [ -n undefinedString ] && printf "$undefinedString" | od -c 000 $ [ -n "$undefinedString" ] && printf "$undefinedString" | od