You might do well to read How do I post a question effectively? and Writeup Formatting Tips. In particular, you should be wrapping code in <code> tags and try to make sure published code is runnable as written. You are clearly using modules but have not specified what modules you are using.

Based upon your syntax, I am gussing you are using the Net::SFTP module. From the module's documentation:

$sftp->ls($remote [, $subref ])

Fetches a directory listing of $remote.

If $subref is specified, for each entry in the directory, $subref will be called and given a reference to a hash with three keys: filename, the name of the entry in the directory listing; longname, an entry in a "long" listing like ls -l; and a, a Net::SFTP::Attributes object, which contains the file attributes of the entry (atime, mtime, permissions, etc.).

If $subref is not specified, returns a list of directory entries, each of which is a reference to a hash as described in the previous paragraph.

You can therefore recover the -l result by changing your key from filename to longname. Your sorting options take a little more work, since you need the complete list to sort it. I would suggest you modify your subroutine to return an array ref with the longname and mtime, and then use sort with a custom function on the returned list.

Update: As SilasTheMonk points out below, following this approach requires a closure to cache search results rather than the simple return I describe above.

Update 2: Having reread the above, the return value from an ordinary call to $sftp->ls contains all the information you need to recover your desired result (untested).

my @contents = $sftp->ls($RemoteBaseDirectory . $RemoteOutgoingDirecto
+ry);
my @sorted = sort {$b->{a}->mtime <=> $b->{a}->mtime} @contents;
print $sorted[0]->{longname};
[download]

If the above fails, you need to look at the format of the mtime return to fix the compare.

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