From: Yu-Hsuan Lai <raincolee@...>
Date: 2010-11-28T17:50:37+09:00
Subject: Re: How to use Ruby like shell script?

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On Sun, Nov 28, 2010 at 3:47 AM, Rilindo Foster <rilindo@gmail.com> wrote:

> Yu,
>
> As much as I liked using Ruby, what exactly are you looking to do with ruby
> that you can't do with bash or ksh?
> On Nov 27, 2010, at 9:51 AM, Yu-Hsuan Lai wrote:
>
> > Can I use ruby like my linux shell script(e.x. bash)?(or on the other
> hand,
> > use some ruby in shell script)
> > For example, how to access environmental variables? Redirect stdi/o with
> '|'
> > ?
> > If it's valuable, are there some websites/books talking about this?
> >
> > --
> > Lai, Yu-Hsuan
>
>
>
On Sun, Nov 28, 2010 at 4:16 AM, Stu <stu@rubyprogrammer.net> wrote:

> You also asked for a website resource. I feel this site is pretty
> venerable:
> http://www.shelldorado.com/
>
> I'm sure there are many bourne *again* specific resources out there but I
> only have experience with pure sh (actually Almquist* *sh)
>
> Specific features that bash might give you that can't be expressed inside
> ruby( if any) should be launched with the bash interpreter... though if you
> get that far you may want to reevaluate your program.
>
> You can get path and other info from ENV
>
> of course ruby programs can be launched inside your #!/bin/sh scripts and
> as
> I pointed out the other way around.
>
> Also following the Unix philosophy: *Write programs that do one thing and
> do
> it well. Write programs to work together. Write programs to handle text
> streams, because that is a universal interface.*
>
> And my philosophy: AUTOMATE EVERYTHING =)
>
> happy hacking!
>
> On Sat, Nov 27, 2010 at 1:43 PM, Stu <stu@rubyprogrammer.net> wrote:
> > backticks work very well as well and are in the bourne scripting
> > metaphor. Interpolation (i.e. #{self} will also work inside ruby's
> > back ticks.
> >
> > They will return string. to be used within the program. pipes and
> > redirection can be used inside as so:
> >
> > ps = "$2"
> > pid =  `ps aux | awk '{print #{ps}}'`
> > printf pid
> >
> > $$ gives you the ruby programs process id
> > $0 returns a string of the program that is running
> > $* will give you arg list
> >
> > here = <<FILE
> >  will work as
> >  well which also
> >  include #{interpolation}
> > FILE
> >
> > Others can be found in a file called English.rb
> >
> > ~
> >
>

OH, sorry for my poor English.
Infact what I want to do is not "use ruby like shell script" but "use shell
in ruby".
For instant, I wonder if I can use "ls | grep" or "tar -xvf | grep" to get a
file list and store it in a ruby array, and handle them with io#gets.

I don't know what "back ticks" are.

Thank for all the replies.
-- 
Lai, Yu-Hsuan

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