From: Jan Svitok <jan.svitok@...>
Date: 2006-08-17T02:01:21+09:00
Subject: Re: 2 questions from a beginner

On 8/16/06, Diego Virasoro <Diego.Virasoro@gmail.com> wrote:
> Hi,
> I am currently trying to find the solution to these two problems, but
> my first look at the documentation didn't give any good answer, so here
> I go... :)
>
> 1-I would like my ruby program to call shell command "ps". So far I've
> found I can use Kernel#system and Kernel#exec but I need to save the
> result into a variable so that I can then manipulate it and neither of
> these seem to help there. How could I do this?
>
> 2-In creating a simple Tk interface I need to have 3 labels and 3 text
> entries connected with 3 variables. So for example I would have:
> 1-labels: hoursLabel, minsLabel, secsLabel
> 2-entries: hoursEntry, minsEntry, secsEntry
> 3-variables: hoursVariable, minsVariable, secsVariable
>
> As you can imagine there is a lot of repetition in the code, so I was
> wondering if there is any way to create a variable called, say, xEntry
> where x is itself a string stored in another variable. In this way I
> could have three string variables "hours", "mins", "secs", and the
> computer would create the 9 variables listed above and initialize them
> (since the initialization code is almost identical)
>
> Mmm... I hope I was clear.
>
> Thanks in advance
>
> Diego Virasoro

Hi,

try:
1. out = `ps` (Kernel#backtick)
2. Object#instance_variable_set( "@#{x}Entry") if it is an instance variable
   eval "#{x}Entry = whatever you need" otherwise