Re^2: grep in line and print

Hello Athanasius, Thanks for the suggestion, But im still getting the error :D I'm trying the code :

#! perl
use strict;
use warnings;

$allmac = "~/temp/allmac.txt";
print $allmac;
while (my $line = $allmac)
{
    if ($line =~ /C4:46:19:75:C1:55/)
    {
        $id = (split /\s+/, $line)[0];
        print "ID = $id\n";
    }
}
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And getting error :

Global symbol "$allmac" requires explicit package name at ./filtermac.
+pl line 5.
Global symbol "$allmac" requires explicit package name at ./filtermac.
+pl line 6.
Global symbol "$allmac" requires explicit package name at ./filtermac.
+pl line 7.
Global symbol "$id" requires explicit package name at ./filtermac.pl l
+ine 11.
Global symbol "$id" requires explicit package name at ./filtermac.pl l
+ine 12.
Execution of ./filtermac.pl aborted due to compilation errors.
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Re^3: grep in line and print
by Athanasius (Archbishop) on Jan 24, 2013 at 05:47 UTC

With use strict in effect, you need to declare your variable names:

my $allmac = ...
...
        my $id = ...
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But the line:

while (my $line = $allmac)
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won’t work: it’s assigning the file name to $line, but it needs to call readline on a file handle, like so:

open (my $fh, '<', $allmac) or die "Can't open file '$allmac' for read
+ing: $!";

while (my $line = <$fh>)
{
    ....
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Applying the diamond operator to a filehandle: <$fh> is the standard way to call readline in Perl. See readline and I/O Operators; also open and perlopentut.

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

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