ok. I'm not getting my question across clearly. Let me try again.
I have a collection of data in a text file. Here is an example:
## foobar.txt ##
one two three
A B C
yes no maybe
In a script (not on the command line) I want to be able to parse this
data so that the first two elements in each line of the file end up in
a hash as a key/value pair. If I was to declare this hash I'm
refering to in a perl script in a literal context, I imagine it would
look like this, given the above text file:
my %myhash = ( one=>two, A=>B, yes=>no );
Perhaps I'm wrong (I am rather new to this Perl stuff!). However, I
do not want to declare it literally, I want to parse the file to
create that hash. The code to parse the file, extract the first two
elements of each line of that file and create a hash of key/value
pairs using those first two elements is what I would like to know how
to do!
Thx!
--Errin
On 13 Aug 2004 16:57:00 +0100, Jose Alves de Castro <[EMAIL PROTECTED]> wrote:
> On Fri, 2004-08-13 at 16:51, Errin Larsen wrote:
> > um, can anyone explain the 'print' function below to me?
> >
> > specifically ... this:
> >
> > 'print "@F[0,5]"'
>
> The -a signal splits the input lines and stores the resulting elements
> in @F
>
> Example:
>
> perl -nae 'print "$F[1]\n"' file.txt
>
> where file.txt contains
>
> one two three
> four five six
>
> prints:
>
> two
> five
>
> Also, although this splitting on spaces, you can also use the -F signal
> to define what you're splitting in.
>
> See `perldoc perlrun`
>
> HTH,
>
> jac
>
> PS:
>
> Oh, print "@F[0,5]", of course, prints the first six elements of @F, and
> since they're between double quotes, they're joined with whatever is in
> $" (usually a space)
>
>
>
> > How do I use this idea in a script instead of a command line? also,
> > how is the input getting into this function? I mean, I understand $_
> > and all, but on a command line, are we piping to that command? what's
> > with the '@F'?
> >
> > Thanks for the help!
> >
> > --Errin
> >
> >
> > On Fri, 13 Aug 2004 09:52:04 -0400, [EMAIL PROTECTED]
> > <[EMAIL PROTECTED]> wrote:
> > > Thanks too all who passed some knowledge on, but I ended up using :
> > >
> > > while (<D>) {
> > >
> > > ## look for 9840S and ebexpire
> > > ## declare OFS = tab
> > > ## tell split to split on IRS 0,1&5. very similar to awk
> > > print $
> > >
> > > if (($_ =~ /9840S/) && ($_ =~ /ebexpire, ebexpire/ )) {
> > > local $, = "\t";
> > > print FOO +(split)[0,1,5], $/;
> > > #print +(split)[0,1,5], $/;
> > >
> > > Derek B. Smith
> > > OhioHealth IT
> > > UNIX / TSM / EDM Teams
> > > 614-566-4145
> > >
> > > "John W. Krahn" <[EMAIL PROTECTED]>
> > > 08/13/2004 08:51 AM
> > >
> > > To: Perl Beginners <[EMAIL PROTECTED]>
> > > cc:
> > > Subject: Re: awk like question
> > >
> > > [EMAIL PROTECTED] wrote:
> > > > All,
> > >
> > > Hello,
> > >
> > > > wasn't sure if this was received b/c I got a reurne to sender error.
> > > >
> > > >
> > > > How can I print certain fields delimited by ' '?
> > > > In awk I would write awk '{print $1, $6}' filename
> > >
> > > The Perl equivalent of that is:
> > >
> > > perl -lane 'print "@F[0,5]"'
> > >
> > > > Here is an out file that I want to grab data from :
> > > >
> > > > 04/29/04 11:00:28 [ 6687:ebexpire, [EMAIL PROTECTED] E00796 9840S 537
> > >
> > > > 2B0234233543E6A4
> > > > 04/29/04 11:00:28 [ 6687:ebexpire, [EMAIL PROTECTED] E00830 9840S 571
> > >
> > > > D402325A8345ABDE
> > > > 04/29/04 11:00:28 [ 6687:ebexpire, [EMAIL PROTECTED] E00066 9840S 127
> > >
> > > > 5202333193B75CBB
> > > > 04/29/04 11:00:28 [ 6687:ebexpire, [EMAIL PROTECTED] E00501 9840S 168
> > >
> > > > 4B0233BABA5813F6
> > > >
> > > > I want fields one two and six or the date, time and E string.
> > > > Does it matter whether I use a foreach or a while (<filehandle>) ?
> > >
> > > You could write that in Perl as:
> > >
> > > perl -lane 'print "@F[0,1,5]"'
> > >
> > > John
> > > --
> > > use Perl;
> > > program
> > > fulfillment
> > >
> > > --
> > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > For additional commands, e-mail: [EMAIL PROTECTED]
> > > <http://learn.perl.org/> <http://learn.perl.org/first-response>
> > >
> > >
> --
> José Alves de Castro <[EMAIL PROTECTED]>
> http://natura.di.uminho.pt/~jac
>
>
>
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