Jasmine
Administrator
Jan 19, 2001, 2:57 PM
Post #1 of 1
(2002 views)
|
|
How do I extract selected columns from a string?
|
Can't Post
|
|
(From the Perl FAQ)
How do I extract selected columns from a string?
Use substr() or unpack(), both documented in the perlfunc manpage. If you prefer thinking in terms of columns instead of widths, you can use this kind of thing: # determine the unpack format needed to split Linux ps output
# arguments are cut columns
my $fmt = cut2fmt(8, 14, 20, 26, 30, 34, 41, 47, 59, 63, 67, 72);
sub cut2fmt {
my(@positions) = @_;
my $template = '';
my $lastpos = 1;
for my $place (@positions) {
$template .= "A" . ($place - $lastpos) . " ";
$lastpos = $place;
}
$template .= "A*";
return $template;
} |
MAIN
SEARCH
WHO'S 
LOG 