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comp.lang.ruby

Invocation of ruby interpreter for .rb files under bash

user@domain.invalid

9/25/2008 11:43:00 AM

Hello, this is not really related to the core language by itself but I
don't remember how to have the interpreter launched when typing foo.rb
or foo (if foo is the name of the script) under bash ?

I remember that I have to put something like
#! /usr/ruby

at the beginnin of the script but I don't remember the right syntax and
didn't found a Google way to express it.



Thanks
6 Answers

Lex Williams

9/25/2008 11:51:00 AM

0

the first line should be

#!/usr/bin/ruby

or wherever your script is.

Next, you have to mark the script as beeing executable .

chmod +x foo.rb

Note that since the first line of your script is #!/usr/bin/ruby ( or
wherever your ruby binary is located ) , the script's name doesn't have
to end with .rb.
After that , you can just write :
/foo
--
Posted via http://www.ruby-....

Maciej Tomaka

9/25/2008 11:51:00 AM

0

Zouplaz wrote:
> Hello, this is not really related to the core language by itself but I
> don't remember how to have the interpreter launched when typing foo.rb
> or foo (if foo is the name of the script) under bash ?
>
> I remember that I have to put something like
> #! /usr/ruby
>
> at the beginnin of the script but I don't remember the right syntax and
> didn't found a Google way to express it.
>
>
>
> Thanks
#!/usr/bin/ruby


to check the path please use: which ruby
on my box it returned /usr/bin/ruby
$ which ruby
/usr/bin/ruby

Regards

--
Posted via http://www.ruby-....

Stefano Crocco

9/25/2008 11:52:00 AM

0

Alle Thursday 25 September 2008, Zouplaz ha scritto:
> Hello, this is not really related to the core language by itself but I
> don't remember how to have the interpreter launched when typing foo.rb
> or foo (if foo is the name of the script) under bash ?
>
> I remember that I have to put something like
> #! /usr/ruby
>
> at the beginnin of the script but I don't remember the right syntax and
> didn't found a Google way to express it.
>
>
>
> Thanks

You're almost there. It's #! followed by a space then the path of the ruby
executable:

#! /usr/bin/ruby

Another option is this:

#! /usr/bin/env ruby

This way, you don't need to know the position of the ruby executable, but only
of the env executable (which, I suppose, should be more standard). The
downside is that, at least with bash, you can't pass options to ruby. For
example, the line

#! /usr/bin/env ruby -w

tries to get from env the path of the program ruby -w. Since ruby -w is not a
program, you get an error.

In the first way, instead, you can pass options to ruby:

#! /usr/bin/ruby -w

Stefano

Yaser Sulaiman

9/25/2008 11:59:00 AM

0

[Note: parts of this message were removed to make it a legal post.]

You should put the following line at the beginning of the script:
#!/usr/bin/env ruby

Then, you should make your script executable using the chmod command:
Prefacechmod +x foo.rb

Now, you should be able to run the script by typing:
/foo.rb

Regards,
Yaser Sulaiman

On Thu, Sep 25, 2008 at 2:44 PM, Zouplaz <user@domain.invalid> wrote:

> Hello, this is not really related to the core language by itself but I
> don't remember how to have the interpreter launched when typing foo.rb or
> foo (if foo is the name of the script) under bash ?
>
> I remember that I have to put something like
> #! /usr/ruby
>
> at the beginnin of the script but I don't remember the right syntax and
> didn't found a Google way to express it.
>
>
>
> Thanks
>
>

Randy Kramer

9/25/2008 3:02:00 PM

0

On Thursday 25 September 2008 07:50 am, Lex Williams wrote:
> the first line should be
> #!/usr/bin/ruby
> or wherever your script is.

^ s/script/ruby interpreter/

> Next, you have to mark the script as beeing executable .
>
> chmod +x foo.rb
>
> Note that since the first line of your script is #!/usr/bin/ruby ( or
> wherever your ruby binary is located ) , the script's name doesn't
have
> to end with .rb.

> After that , you can just write :
> ./foo

... assuming (I know) you are "in" the directory where the script is.

Alternatively, you can:

* put the script in a directory on the path that Linux searches for
executables (then just type foo) (run =set | grep PATH=)
* change the path which Linux searches for executables to include the
path where your script is located (again, run =set | grep PATH=)
* include the full path to the executable on the command line,
e.g.: /<whatever>/foo

(Just feeling pedantic, I guess.)

Randy Kramer
--
I didn't have time to write a short letter, so I created a video
instead.--with apologies to Cicero, et.al.

user@domain.invalid

9/26/2008 8:10:00 AM

0

le 25/09/2008 13:42, Zouplaz nous a dit:
> Hello, this is not really related to the core language by itself but I
> don't remember how to have the interpreter launched when typing foo.rb
> or foo (if foo is the name of the script) under bash ?
>
> I remember that I have to put something like
> #! /usr/ruby
>
> at the beginnin of the script but I don't remember the right syntax and
> didn't found a Google way to express it.
>

Thanks all for you help, now the script files are executed the right way !