I'm using sed to alter a parameter file used in another process. Basically, the file is a template containing a few variables which need to be replaced at runtime.
The problem is that using sed with filenames that contain the / character causes matches to fail.
eg:... (3 Replies)
I'm using sed to alter a parameter file used in another process. Basically, the file is a template containing a few variables which need to be replaced at runtime.
The problem is that using sed with filenames that contain the / character causes matches to fail.
I've tried doing an escaped... (2 Replies)
I am trying to pass a regular expression variable from a simple script to sed
to remove entries from a text file
e.g.
a='aaaa bbbb cccc ...|...:'
then executing sed from the script
sed s'/"'$a"'//g <$FILE > $FILE"_"1
my output file is always the same as the input file !!
any... (1 Reply)
Hi
Im trying to use sed to change some files which I'll describe here:
I want to use a regular expression to grab the <body> tag from a document. However, the <body> tag can look different so the regular expression used will take care of that and "include" all types of bodies, in example:... (4 Replies)
Ok, so I get that:
sed -n '/START/,/END/p' file
...will print every line from START to END inclusive, but I don't want to see START or END. Apart from the obious:
sed -n '/START/,/END/p' file | grep -v "START" | grep -v "END"
...is there a simpler way of doing this?
Thanks as always! (2 Replies)
I have a file that I'm trying to find all the cases of phone number extensions and deleting them. So input file looks like:
abc
x93825
def
13234
x52673
hello
output looks like:
abc
def
13234
hello
Basically delete lines that have 5 numbers following "x". I tried: x\(4) but it... (7 Replies)
I have a file, each line has the date and time twice, once at the start of the line, and again half way along. to neaten things up, and to make it easier to read i'm removing one set.
Wasn't as easy as identify the text and remove, as it'd remove both.
So i added some text at the beginning of... (4 Replies)
Linux 6.X environments (RHEL, Oracle Linux )
I could write basic shell scripts in bash.
In my spare time, I was planning to learn awk or sed to deal with regular expression tasks I have to deal with. But, I gather that python is gaining popularity these days and I came to know that python has a... (5 Replies)
I need to pick a part of string lets stay started with specific character and end with specific character to replace using sed command
the line is like this:my audio book 71-skhdfon1dufgjhgf8.wav'
I want to move the characters beginning with - end before.
I have different files with random... (2 Replies)
Discussion started by: XP_2600
2 Replies
LEARN ABOUT MOJAVE
html::linkextor5.18
HTML::LinkExtor(3) User Contributed Perl Documentation HTML::LinkExtor(3)NAME
HTML::LinkExtor - Extract links from an HTML document
SYNOPSIS
require HTML::LinkExtor;
$p = HTML::LinkExtor->new(&cb, "http://www.perl.org/");
sub cb {
my($tag, %links) = @_;
print "$tag @{[%links]}
";
}
$p->parse_file("index.html");
DESCRIPTION
HTML::LinkExtor is an HTML parser that extracts links from an HTML document. The HTML::LinkExtor is a subclass of HTML::Parser. This means
that the document should be given to the parser by calling the $p->parse() or $p->parse_file() methods.
$p = HTML::LinkExtor->new
$p = HTML::LinkExtor->new( $callback )
$p = HTML::LinkExtor->new( $callback, $base )
The constructor takes two optional arguments. The first is a reference to a callback routine. It will be called as links are found. If
a callback is not provided, then links are just accumulated internally and can be retrieved by calling the $p->links() method.
The $base argument is an optional base URL used to absolutize all URLs found. You need to have the URI module installed if you provide
$base.
The callback is called with the lowercase tag name as first argument, and then all link attributes as separate key/value pairs. All
non-link attributes are removed.
$p->links
Returns a list of all links found in the document. The returned values will be anonymous arrays with the following elements:
[$tag, $attr => $url1, $attr2 => $url2,...]
The $p->links method will also truncate the internal link list. This means that if the method is called twice without any parsing
between them the second call will return an empty list.
Also note that $p->links will always be empty if a callback routine was provided when the HTML::LinkExtor was created.
EXAMPLE
This is an example showing how you can extract links from a document received using LWP:
use LWP::UserAgent;
use HTML::LinkExtor;
use URI::URL;
$url = "http://www.perl.org/"; # for instance
$ua = LWP::UserAgent->new;
# Set up a callback that collect image links
my @imgs = ();
sub callback {
my($tag, %attr) = @_;
return if $tag ne 'img'; # we only look closer at <img ...>
push(@imgs, values %attr);
}
# Make the parser. Unfortunately, we don't know the base yet
# (it might be different from $url)
$p = HTML::LinkExtor->new(&callback);
# Request document and parse it as it arrives
$res = $ua->request(HTTP::Request->new(GET => $url),
sub {$p->parse($_[0])});
# Expand all image URLs to absolute ones
my $base = $res->base;
@imgs = map { $_ = url($_, $base)->abs; } @imgs;
# Print them out
print join("
", @imgs), "
";
SEE ALSO
HTML::Parser, HTML::Tagset, LWP, URI::URL
COPYRIGHT
Copyright 1996-2001 Gisle Aas.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.18.2 2013-03-25 HTML::LinkExtor(3)