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> -----Original Message-----
> From: list-bounce / example.com 
> [mailto:list-bounce / example.com] On Behalf Of Pieter Jongsma
> Sent: Sunday, September 09, 2007 6:57 AM
> To: ruby-talk ML
> Subject: Run UNIX command
> 
> Hi,
> 
> I'm looking for a way to execute an UNIX command from a ruby program.
> For instance, when the user selected a .tar.gz file, using the untar
> command to decompress it.
> How can I do that?
> 
> Thanks in advance!
> pieter.
> -- 
> Posted via http://www.ruby-forum.com/.
> 

There are several ways to make system calls:

$ irb
irb(main):001:0> exec "echo Hi"
Hi
$

exec replaces the current process with the given external command

$ irb
irb(main):001:0> system "echo Hi"
Hi
true

system runs the external command and returns true on success and false on
failure

irb(main):002:0> `echo Hi`
"Hi\n"
irb(main):003:0> %x{ echo Hi }
"Hi\n"
irb(main):004:0> 

backticks and the %x literal execute the external command and return its
output.


HTH,

Felix

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