how to get the env of one PID .
my $file="/proc/1/environ";
system "xxd $file";
open FILE,"< $file" or die "open $file err:$!";
my $c=<FILE>;
close FILE;
my $hex=unpack "H*",$c;
print "\n$hex\n\n";
my @list=split /00/,$hex;
foreach (@list) {
print pack ("H*",$_) . "\n";
}
> -----邮件原件-----
> 发件人: Shlomi Fish [mailto:shlo...@iglu.org.il]
> 发送时间: 2009年11月19日 23:24
> 收件人: beginners@perl.org
> 抄送: gaochong
> 主题: Re: the question of one program
>
> On Thursday 19 Nov 2009 16:54:00 gaochong wrote:
> > Now I have see the following page ,but I have some question and need help .
> >
> > http://www.cpan.org/authors/id/S/SU/SUJAI/Process-Detail-0.1.pl
> >
>
> From a quick look, this script seems awful:
>
> 1. No "use strict;" and "use warnings;".
>
> 2. uses "Switch.pm".
>
> 3. Uses bareword file-handles.
>
> 4. No three-args open.
>
> I would suggest to avoid using it because it's not modern perl.
>
> >
> >
> > first,what is the meaning of if($pcs =~ /(\d+)/ && $pcs =~ /\./) ，I can’t
> > understand the re /\./
> >
>
> "." matches any character (except possibly newline, etc., but sometimes also
> that if you use m{...}s). "\." inside a regex matches an actual "." (period,
> dot, full stop etc. - http://en.wikipedia.org/wiki/Full_stop )
>
>
> >
> >
> > sub hidden
> >
> > {
> >
> > print "\n##########Hidden processlist###############\n\n";
> >
> > foreach $pcs (readdir(DIR))
> >
> > {
> >
> > if($pcs =~ /(\d+)/ && $pcs =~ /\./)
> >
> > {
> >
> > &detailedview("$pcs");
> >
> > }
> >
> > }
> >
> > }
> >
> >
> >
> > the second , @array=split(/([A-Z]+(_|[A-Z])+\=.[^A-Z]+)/,$_);
> > also the re \=.[^A-Z]+ what’s it ?
>
> \= is an actual "=". A "=" would be fine here, too. "." is any character
> except a newline. "[^A-Z]" is any character except the uppercase Latin ASCII
> letters ("A", "B", "C"..."Z"). "+" is "one or more" when applied to the
> suffix. You can see signs of "ancient perl" in this expression, because it
> uses several capturing parentheses ("(...)") instead of clustering ones
> ("(?:...)").
>
> http://www.shlomifish.org/lecture/Perl/Newbies/lecture2/regexps/next_step.
> html
> >
> >
> >
> >
> >
> > open(FILE,"<$envir");
>
> This should better be:
>
> <<<
> open my $file, "<", $envir
> or die "....$!";
>
> >>>
>
> This script is horrible. Avoid it.
>
> Regards,
>
> Shlomi Fish
>
> > while(<FILE>)
> > {
> > @array=split(/([A-Z]+(_|[A-Z])+\=.[^A-Z]+)/,$_);
> >
> > thanks
> >
>
> --
> -----------------------------------------------------------------
> Shlomi Fish http://www.shlomifish.org/
> http://www.shlomifish.org/humour/ways_to_do_it.html
>
> Chuck Norris read the entire English Wikipedia in 24 hours. Twice.
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