# Get list of remote files
my @remote_files= qx(ssh $uid $h 'find $dirname');

##</code><code>##

# Munge filenames to commands:
my @commands= map { sprintf "mv -i '%s' '%s.bak'",
                              quotemeta($_), quotemeta($_)
                  } @remote_files;

##</code><code>##

# Send list of commands to the remote side:
# First, a dry-run instead of actually doing that:
my $remote= \*STDOUT;
# Use this to actually do the remote execution:
#open $remote, "| ssh -q -l $uid $h";
print { $remote } join "\n", @commands;