With the following file, t.rb,

----
#!/usr/bin/env ruby

$0 = 'My Application'
puts $0
----

the output is:

$ ruby -v t.rb
ruby 1.8.1 (2003-12-05) [i686-linux]
My Applicati

Why does it get truncated?

>
> With the following file, t.rb,
>
> ----
> #!/usr/bin/env ruby
>
> $0 = 'My Application'
> puts $0
> ----
>
> the output is:
>
> $ ruby -v t.rb
> ruby 1.8.1 (2003-12-05) [i686-linux]
> My Applicati
>
> Why does it get truncated?


8.3 format?  ;)  (It's the right number of characters, just no dot.)

On Thu, Dec 18, 2003 at 03:08:39PM +0900, Joel VanderWerf wrote:
> #!/usr/bin/env ruby
> 
> $0 = 'My Application'
> puts $0
> ----
> 
> the output is:
> 
> $ ruby -v t.rb
> ruby 1.8.1 (2003-12-05) [i686-linux]
> My Applicati

Looks like a bug.  I find it suggestive that the length of the truncated
string is 12 characters - the same length as an 8+3 filename including the
period.

It gets even more interesting, however: the same code works as an -e
expression:

	$ ruby -ve '$0 = "My Application"; puts $0'
	ruby 1.8.1 (2003-12-05) [i686-linux]
	My Application

(Different quotes for ease of keeping the shell out; I verified that
 changing the quotes in t.rb to double didn't affect the beahvior)

-Mark

Hi,

In message "setting $0"
    on 03/12/18, Joel VanderWerf <vjoel@PATH.Berkeley.EDU> writes:

|With the following file, t.rb,
|
|----
|#!/usr/bin/env ruby
|
|$0 = 'My Application'
|puts $0
|----
|
|the output is:
|
|$ ruby -v t.rb
|ruby 1.8.1 (2003-12-05) [i686-linux]
|My Applicati
|
|Why does it get truncated?

It's a Linux restriction.  Wishing if linux has setproctitle(3).
Interestingly, my linux box has a setproctitle man page.

							matz.

I experienced the same problem just 2 weeks ago. It happens on Solaris 
as well as on Linux. I was about to post it here, when I found a work 
around: you can use $0.replace instead of $0=

Gennady.

Yukihiro Matsumoto wrote:
> Hi,
> 
> In message "setting $0"
>     on 03/12/18, Joel VanderWerf <vjoel@PATH.Berkeley.EDU> writes:
> 
> |With the following file, t.rb,
> |
> |----
> |#!/usr/bin/env ruby
> |
> |$0 = 'My Application'
> |puts $0
> |----
> |
> |the output is:
> |
> |$ ruby -v t.rb
> |ruby 1.8.1 (2003-12-05) [i686-linux]
> |My Applicati
> |
> |Why does it get truncated?
> 
> It's a Linux restriction.  Wishing if linux has setproctitle(3).
> Interestingly, my linux box has a setproctitle man page.
> 
> 							matz.
>