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Re: creating custom switches in my program?
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From:
Tanton Gibbs
Date:
March 7, 2002 08:55
Subject:
Re: creating custom switches in my program?
Message ID:
014a01c1c5f8$920d7000$81486e0a@brooklyn
Sorry...
use vars qw($opt_d);
----- Original Message -----
From: "M z" <kpslater777@yahoo.com>
To: "Tanton Gibbs" <thgibbs@deltafarms.com>
Cc: <beginners@perl.org>
Sent: Thursday, March 07, 2002 11:52 AM
Subject: creating custom switches in my program?
> Mr. Gibbs
>
> thank you for your help
>
> but when I just implemented the use directives and
> getopts subroutine call
>
> use strict;
> use Getopt::Std;
> use vars qw(opt_d);
>
> getopts("d:");
>
> the compiler is complaining, namely
>
> 'opt_d' is not a valid variable name at my script ...
> BEGIN failed--compilation aborted
>
> I ran this under perl 5.6 on windows 98 for testing
> purposes, if you could shed some more light on me that
> would be great!
>
>
>
>
> --- Tanton Gibbs <thgibbs@deltafarms.com> wrote:
> > use strict;
> > use Getopt::Std;
> > use vars qw( opt_d );
> >
> > getopts( "d" );
> >
> > #getopts will set $opt_X where X is the letter of
> > the option, so in this
> > case it will set $opt_d. The use vars
> > #statement told perl that $opt_d was a global
> > variable (much the same as our
> > $opt_d, but works on older perls)
> > #If opt_d is defined, then the option was specified
> > on the command line,
> > otherwise it was not given. If you wanted
> > #to take an argument such as myprog -d filename,
> > then you would say:
> > #getopts("d:")
> > #which makes -d take an argument. Then, the
> > argument name would be in
> > $opt_d if -d was present.
> >
> > if( defined( $opt_d ) ) {
> > print "Option d was given!";
> > }
> > else {
> > print "Option d was not given!";
> > }
> >
> > Good luck!
> > Tanton
> > ----- Original Message -----
> > From: "M z" <kpslater777@yahoo.com>
> > To: <beginners@perl.org>
> > Sent: Tuesday, March 05, 2002 10:26 AM
> > Subject: creating custom switches in my program?
> >
> >
> > > Hello
> > >
> > > I was looking into documentation on the getopts
> > > module, but was having some difficulty
> > understanding
> > > how to implement it.
> > >
> > > The scope of my problem is quite simple, actually.
> > > can someone help me create a snippet where if no
> > > argument is specified at the command line, than
> > the
> > > output is written out to the input file, and if an
> > > option is given (say -d) at the comment line, the
> > > program subsequently prompts the user for the
> > > destination to write to?
> > >
> > > thanks, I think this is easier than I'm making it
> > out
> > > to be, but I have no experience implementing the
> > > getopts module.
> > >
> > >
> > >
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> > > --
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> > >
> >
>
>
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