RE: Passing options to command in a system call

[Bob Showalter]

Jan Eden wrote:
> Hi,
> 
> I try to call wget using system like this:
> 
> system("wget -O /dev/null", "http://janeden.org/test/file.txt";);
> 
> This does not work:
> 
> Can't exec "wget -O /dev/null": No such file or directory at
> ./wgetrec.pl line 6. 
> 
> Ok, so how about this:
> 
> system("wget", "-O /dev/null http://janeden.org/test/file.txt";);
> 
> No go:
> 
> wget: missing URL
> 
> Without additional options,
> 
> system("wget", "http://janeden.org/test/file.txt";);
> 
> works fine.
> 
> How can I pass an option to system's first argument in a setting like
> this? 

This is explained in 'perldoc -f system'

You either need to separate all the args yourself, or pass a single string
to system so the shell can split the args. You're trying to do both.

either:

   system("wget -O /dev/null http://janeden.org/test/file.txt";)

or:

   system('wget', '-O', '/dev/null', 'http://janeden.org/test/file.txt')

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Re: Passing options to command in a system call

[Doug Lewis]

I haven't used the wget program before, but try adding a comma after your -O.  I did 
that and I got it working.

Jan Eden <[EMAIL PROTECTED]> wrote:Hi,

I try to call wget using system like this:

system("wget -O /dev/null", "http://janeden.org/test/file.txt";);

This does not work:

Can't exec "wget -O /dev/null": No such file or directory at ./wgetrec.pl line 6.

Ok, so how about this:

system("wget", "-O /dev/null http://janeden.org/test/file.txt";);

No go:

wget: missing URL

Without additional options,

system("wget", "http://janeden.org/test/file.txt";);

works fine.

How can I pass an option to system's first argument in a setting like this?

(I know I can use a module instead of calling wget, but this is a more general issue.)

Thanks,

Jan
-- 
If all else fails read the instructions. - Donald Knuth

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Re: Passing options to command in a system call

[Errin Larsen]

On Fri,  1 Oct 2004 17:41:50 +0200, Jan Eden <[EMAIL PROTECTED]> wrote:
> Hi,

  Hello!

<>

> 
> How can I pass an option to system's first argument in a setting like this?
> 
> (I know I can use a module instead of calling wget, but this is a more general 
> issue.)
> 
> Thanks,
> 
> Jan
> --

This is ironic:

> If all else fails read the instructions. - Donald Knuth

First, check out 'perldoc -f system'  The answer to you question is in
the first paragraph!

Second, try passing EACH argument as a seperate value:
  ((WARNING: I don't have wget, so I couldn't test this!))

system("wget", "-O", "/dev/null", "http://janeden.org/test/file.txt";);

--Errin

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Re: Passing options to command in a system call

[Jan Eden]

Thanks, Errin, Doug and Bob,

Errin Larsen wrote on 01.10.2004:

>On Fri,  1 Oct 2004 17:41:50 +0200, Jan Eden <[EMAIL PROTECTED]>
>wrote:

>>How can I pass an option to system's first argument in a setting
>>like this?
>
>This is ironic:
>
>>If all else fails read the instructions. - Donald Knuth
>
>First, check out 'perldoc -f system'  The answer to you question is
>in the first paragraph!
>
I *did* read the perldoc, of course. But I obviously misunderstood it and carefully 
avoided *both* working combination (single argument or four arguments to system). I 
thought that using three arguments (command, options, url) would cause Perl to execute

wget -O /dev/null http://janeden.org

Obviously, it only does this when getting the whole string split on whitespace *or* in 
one piece. Should have tried before wasting your time. Sorry.

- Jan
-- 
How many Microsoft engineers does it take to screw in a lightbulb? None. They just 
redefine "dark" as the new standard.

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