Not quite matching your spec but here you go. I implemented as much as I would use...
my %path;
my ($high, $low) = (0,0);
for (split /:/, $ENV{PATH} ){
next if exists $path{$_}; # remove duplicates
$path{$_} = $high;
++$high;
}
for (@ARGV){
/^-(.*)/ and do {delete $path{$1} if exists $path{$1}; next;};
/^\+\+(.*)/ and do {--$low; $path{$1}=$low unless exists $path{$1};
+next;};
/^\+(.*)/ and do {++$high; $path{$1}=$high unless exists $path{$1};
+next;};
}
print join ":", sort {$path{$a} <=> $path{$b} } keys %path;
print "\n";
-- Murray Barton Do not seek to follow in the footsteps of the wise. Seek what they sought. -Basho
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|