The following example only covers the first half of your requirement and you'll probably get already got more direct answers since Perl evolved from the shell and they will probably be fine but there are advantages to doing it quite formally. This is how I do things like that now- 

use strict;
use Cwd "cwd";
use Path::Class ();
use File::Spec ();

my $dir = Path::Class::Dir->new( File::Spec->rel2abs( cwd() ) );
print "OH HAI, IZ IN $dir!\n";

my $target = eval { $dir->parent->parent } or
    die "Couldn't find the grandparent of '$dir': $@";

chdir($target) or die "Couldn't chdir($target)";
my $cwd = cwd();
print "OH HAI AGIN, IZ IN $cwd!\n";

[download]

It's more verbose and more complex (needs three modules) but it is (I think) more robust and leaves open many avenues and offers ancillary power-tools for working with dirs and files. It's also easier to debug and put in sensible tests.

In reply to Re: Command line works by Your Mother
in thread Command line works by sandy1028

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.