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Re: Storing system grep's output to an array in perl

by rnewsham (Curate)
on Mar 07, 2013 at 11:41 UTC ( [id://1022213]=note: print w/replies, xml ) Need Help??


in reply to Storing system grep's output to an array in perl

The horrible way, which I do not recommend, would be to shell out with backticks

my @tops = `/bin/grep -i "top-" filename | /usr/bin/awk '(print $3)'`;

[download]

A better way would be something like

my @tops;
open FILE, "<filename" or die "could not open filename";
while ( <FILE> )
{
    if ( m/^top \- (\d{2}:\d{2}:\d{2})/ )
    {
        push @tops, $1;
    }
}
close FILE;

[download]

Replies are listed 'Best First'.
Re^2: Storing system grep's output to an array in perl
by SuicideJunkie (Vicar) on Mar 07, 2013 at 19:03 UTC

    Or even better:

    my @tops;
open my $inputFileHandle, '<', $filename or die "could not open '$file
+name', because the OS said: $!";
while ( <$inputFileHandle> )
{
    if ( m/^top \- (\d{2}:\d{2}:\d{2})/ )
    {
        push @tops, $1;
    }
}

    [download]
[reply]
[d/l]

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